diff --git a/Source/OCMock/OCPartialMockObject.m b/Source/OCMock/OCPartialMockObject.m
index 6a7c53c3..b3019e03 100644
--- a/Source/OCMock/OCPartialMockObject.m
+++ b/Source/OCMock/OCPartialMockObject.m
@@ -206,6 +206,9 @@ - (void)setupForwarderForSelector:(SEL)sel
     Method originalMethod = class_getInstanceMethod(mockedClass, sel);
     /* Might be NULL if the selector is forwarded to another class */
     IMP originalIMP = (originalMethod != NULL) ? method_getImplementation(originalMethod) : NULL;
+    if(originalIMP == NULL)
+        return;
+
     const char *types = (originalMethod != NULL) ? method_getTypeEncoding(originalMethod) : NULL;
     // TODO: check the fallback implementation is actually sufficient
     if(types == NULL)