Index: src/OFObject.m
==================================================================
--- src/OFObject.m
+++ src/OFObject.m
@@ -545,19 +545,25 @@
 
 - (id)performSelector: (SEL)selector
 {
 	id (*imp)(id, SEL) = (id(*)(id, SEL))[self methodForSelector: selector];
 
+	if OF_UNLIKELY (imp == NULL)
+		[self doesNotRecognizeSelector: selector];
+
 	return imp(self, selector);
 }
 
 - (id)performSelector: (SEL)selector
 	   withObject: (id)object
 {
 	id (*imp)(id, SEL, id) =
 	    (id(*)(id, SEL, id))[self methodForSelector: selector];
 
+	if OF_UNLIKELY (imp == NULL)
+		[self doesNotRecognizeSelector: selector];
+
 	return imp(self, selector, object);
 }
 
 - (id)performSelector: (SEL)selector
 	   withObject: (id)object1
@@ -564,10 +570,13 @@
 	   withObject: (id)object2
 {
 	id (*imp)(id, SEL, id, id) =
 	    (id(*)(id, SEL, id, id))[self methodForSelector: selector];
 
+	if OF_UNLIKELY (imp == NULL)
+		[self doesNotRecognizeSelector: selector];
+
 	return imp(self, selector, object1, object2);
 }
 
 - (void)performSelector: (SEL)selector
 	     afterDelay: (double)delay