diff --git a/Foundation/CPPredicate/CPComparisonPredicate.j b/Foundation/CPPredicate/CPComparisonPredicate.j
index ffe374e7a..a7843308e 100644
--- a/Foundation/CPPredicate/CPComparisonPredicate.j
+++ b/Foundation/CPPredicate/CPComparisonPredicate.j
@@ -275,7 +275,7 @@ var CPComparisonPredicateModifier,
     if (self === anObject)
         return YES;
 
-    if (anObject.isa !== self.isa || _modifier !== [anObject comparisonPredicateModifier] || _type !== [anObject predicateOperatorType] || _options !== [anObject options] || _customSelector !== [anObject customSelector] || ![_left isEqual:[anObject leftExpression]] || ![_right isEqual:[anObject rightExpression]])
+    if (anObject === nil || anObject.isa !== self.isa || _modifier !== [anObject comparisonPredicateModifier] || _type !== [anObject predicateOperatorType] || _options !== [anObject options] || _customSelector !== [anObject customSelector] || ![_left isEqual:[anObject leftExpression]] || ![_right isEqual:[anObject rightExpression]])
         return NO;
 
     return YES;
diff --git a/Foundation/CPPredicate/CPCompoundPredicate.j b/Foundation/CPPredicate/CPCompoundPredicate.j
index 8eaeb709f..e36ceb0d0 100644
--- a/Foundation/CPPredicate/CPCompoundPredicate.j
+++ b/Foundation/CPPredicate/CPCompoundPredicate.j
@@ -215,7 +215,7 @@ var CPCompoundPredicateType;
     if (self === anObject)
         return YES;
 
-    if (anObject.isa !== self.isa || _type !== [anObject compoundPredicateType] || ![_predicates isEqualToArray:[anObject subpredicates]])
+    if (anObject === nil || anObject.isa !== self.isa || _type !== [anObject compoundPredicateType] || ![_predicates isEqualToArray:[anObject subpredicates]])
         return NO;
 
     return YES;
diff --git a/Foundation/CPPredicate/_CPAggregateExpression.j b/Foundation/CPPredicate/_CPAggregateExpression.j
index b010881a7..688166398 100644
--- a/Foundation/CPPredicate/_CPAggregateExpression.j
+++ b/Foundation/CPPredicate/_CPAggregateExpression.j
@@ -42,7 +42,7 @@
     if (self === object)
         return YES;
 
-    if (object.isa !== self.isa || ![[object collection] isEqual:_aggregate])
+    if (object === nil || object.isa !== self.isa || ![[object collection] isEqual:_aggregate])
         return NO;
 
     return YES;
diff --git a/Foundation/CPPredicate/_CPConstantValueExpression.j b/Foundation/CPPredicate/_CPConstantValueExpression.j
index 5ffa9e07a..617c9b10a 100644
--- a/Foundation/CPPredicate/_CPConstantValueExpression.j
+++ b/Foundation/CPPredicate/_CPConstantValueExpression.j
@@ -45,7 +45,7 @@
     if (self === object)
         return YES;
 
-    if (object.isa !== self.isa || ![[object constantValue] isEqual:_value])
+    if (object === nil || object.isa !== self.isa || ![[object constantValue] isEqual:_value])
         return NO;
 
     return YES;
diff --git a/Foundation/CPPredicate/_CPFunctionExpression.j b/Foundation/CPPredicate/_CPFunctionExpression.j
index 75b1619fc..394c93612 100644
--- a/Foundation/CPPredicate/_CPFunctionExpression.j
+++ b/Foundation/CPPredicate/_CPFunctionExpression.j
@@ -72,7 +72,7 @@
     if (self === object)
         return YES;
 
-    if (object.isa !== self.isa || ![[object _function] isEqual:_selector] || ![[object operand] isEqual:_operand] || ![[object arguments] isEqualToArray:_arguments])
+    if (object === nil || object.isa !== self.isa || ![[object _function] isEqual:_selector] || ![[object operand] isEqual:_operand] || ![[object arguments] isEqualToArray:_arguments])
         return NO;
 
     return YES;
diff --git a/Foundation/CPPredicate/_CPKeyPathExpression.j b/Foundation/CPPredicate/_CPKeyPathExpression.j
index c0694b395..0f9ece8b6 100644
--- a/Foundation/CPPredicate/_CPKeyPathExpression.j
+++ b/Foundation/CPPredicate/_CPKeyPathExpression.j
@@ -51,7 +51,7 @@
     if (object === self)
         return YES;
 
-    if (object.isa !== self.isa || ![[object keyPath] isEqualToString:[self keyPath]])
+    if (object === nil || object.isa !== self.isa || ![[object keyPath] isEqualToString:[self keyPath]])
         return NO;
 
     return YES;
diff --git a/Foundation/CPPredicate/_CPPredicate.j b/Foundation/CPPredicate/_CPPredicate.j
index d2d8544db..367b65f48 100644
--- a/Foundation/CPPredicate/_CPPredicate.j
+++ b/Foundation/CPPredicate/_CPPredicate.j
@@ -190,7 +190,7 @@
     if (self === anObject)
         return YES;
 
-    if (self.isa !== anObject.isa || _value !== [anObject evaluateWithObject:nil])
+    if (anObject === nil || self.isa !== anObject.isa || _value !== [anObject evaluateWithObject:nil])
         return NO;
 
     return YES;
diff --git a/Foundation/CPPredicate/_CPSetExpression.j b/Foundation/CPPredicate/_CPSetExpression.j
index f7d4e673b..a0e9df3bb 100644
--- a/Foundation/CPPredicate/_CPSetExpression.j
+++ b/Foundation/CPPredicate/_CPSetExpression.j
@@ -47,7 +47,7 @@
     if (self === object)
         return YES;
 
-    if (object.isa !== self.isa || ![[object leftExpression] isEqual:_left] || ![[object rightExpression] isEqual:_right])
+    if (object === nil || object.isa !== self.isa || ![[object leftExpression] isEqual:_left] || ![[object rightExpression] isEqual:_right])
         return NO;
 
     return YES;
diff --git a/Foundation/CPPredicate/_CPSubqueryExpression.j b/Foundation/CPPredicate/_CPSubqueryExpression.j
index 78b50be94..a94d88d2c 100644
--- a/Foundation/CPPredicate/_CPSubqueryExpression.j
+++ b/Foundation/CPPredicate/_CPSubqueryExpression.j
@@ -73,7 +73,7 @@
     if (self === object)
         return YES;
 
-    if (object.isa !== self.isa || ![_collection isEqual:[object collection]] || ![_variableExpression isEqual:[object variableExpression]] || ![_subpredicate isEqual:[object predicate]])
+    if (object === nil || object.isa !== self.isa || ![_collection isEqual:[object collection]] || ![_variableExpression isEqual:[object variableExpression]] || ![_subpredicate isEqual:[object predicate]])
         return NO;
 
     return YES;
diff --git a/Foundation/CPPredicate/_CPVariableExpression.j b/Foundation/CPPredicate/_CPVariableExpression.j
index c426d6c60..910ef23d5 100644
--- a/Foundation/CPPredicate/_CPVariableExpression.j
+++ b/Foundation/CPPredicate/_CPVariableExpression.j
@@ -48,7 +48,7 @@
     if (self === object)
         return YES;
 
-    if (object.isa !== self.isa || ![[object variable] isEqual:_variable])
+    if (object === nil || object.isa !== self.isa || ![[object variable] isEqual:_variable])
         return NO;
 
     return YES;
diff --git a/Tests/Foundation/CPObjectTest.j b/Tests/Foundation/CPObjectTest.j
index 926a00238..c10293124 100644
--- a/Tests/Foundation/CPObjectTest.j
+++ b/Tests/Foundation/CPObjectTest.j
@@ -59,6 +59,13 @@
     [self assertTrue:d.indexOf("access:") !== -1 message:"Can't find 'access:' in description of json " + d];
 }
 
+- (void)testCPObjectNotEqualToNil
+{
+    var anObject = [[CPObject alloc] init];
+
+    [self assert:anObject notEqual:nil];
+}
+
 @end
 
 @implementation SuperReceiver : CPObject
diff --git a/Tests/Foundation/CPPredicateTest.j b/Tests/Foundation/CPPredicateTest.j
index 58d6066ae..f810b4fde 100644
--- a/Tests/Foundation/CPPredicateTest.j
+++ b/Tests/Foundation/CPPredicateTest.j
@@ -440,6 +440,64 @@
     [self assert:pred1 equals:pred2];
 }
 
+- (void)testExpressionAndPredicateIsNotEqualToNil
+{
+    var cexp1 = [CPExpression expressionForConstantValue:2],
+        cexp2 = [CPExpression expressionForConstantValue:2];
+    [self assert:cexp1 notEqual:nil];
+
+    var exp1 = [CPExpression expressionForKeyPath:"path"];
+
+    [self assert:exp1 notEqual:nil];
+
+    exp1 = [CPExpression expressionForEvaluatedObject];
+
+    [self assert:exp1 notEqual:nil];
+
+    exp1 = [CPExpression expressionForVariable:"toto"];
+
+    [self assert:exp1 notEqual:nil];
+
+    var left = [CPExpression expressionForConstantValue:[CPSet setWithObjects:@"a",@"b",@"c"]],
+        right = [CPExpression expressionForConstantValue:[CPArray arrayWithObjects:@"a",@"b",@"d"]];
+
+    exp1 = [CPExpression expressionForIntersectSet:left with:right];
+
+    [self assert:exp1 notEqual:nil];
+
+    exp1 = [CPExpression expressionForFunction:cexp1 selectorName:@"isEqual:" arguments:[CPArray arrayWithObjects:cexp2]];
+
+    [self assert:exp1 notEqual:nil];
+
+    var aexp1 = [CPExpression expressionForAggregate:[CPArray arrayWithObjects:cexp1,cexp2]];
+
+    [self assert:aexp1 notEqual:nil];
+
+    exp1 = [CPExpression expressionForSubquery:right usingIteratorVariable:@"self" predicate:[CPPredicate predicateWithValue:YES]];
+
+    [self assert:exp1 notEqual:nil];
+
+    var pred1 = [CPPredicate predicateWithFormat:@"FUNCTION('toto', 'stringByReplacingOccurrencesOfString:withString:', 'o', 'a') == 'tata'"];
+
+    [self assert:pred1 notEqual:nil];
+
+    pred1 = [CPPredicate predicateWithFormat:@"$record.$age = 34"];
+
+    [self assert:pred1 notEqual:nil];
+
+    pred1 = [CPPredicate predicateWithFormat:@"SUBQUERY(Record1.Children, $x, $x BEGINSWITH 'Kid')[SIZE] = 2"];
+
+    [self assert:pred1 notEqual:nil];
+
+    pred1 = [CPPredicate predicateWithFormat:@"$x CONTAINS 'a'"];
+
+    [self assert:pred1 notEqual:nil];
+
+    pred1 = [CPPredicate predicateWithFormat:@"a = 'a' AND b = 'b'"];
+
+    [self assert:pred1 notEqual:nil];
+}
+
 - (void)testProxyArrayFiltering
 {
     var proxyArray = [self mutableArrayValueForKey:@"simpleArray"],