diff --git a/python/python-psi-impl/src/com/jetbrains/python/psi/types/PyCallableTypeImpl.java b/python/python-psi-impl/src/com/jetbrains/python/psi/types/PyCallableTypeImpl.java
index f186f2a76d8e..69131f24fc43 100644
--- a/python/python-psi-impl/src/com/jetbrains/python/psi/types/PyCallableTypeImpl.java
+++ b/python/python-psi-impl/src/com/jetbrains/python/psi/types/PyCallableTypeImpl.java
@@ -167,7 +167,7 @@ public class PyCallableTypeImpl implements PyCallableType {
   @Override
   public @NotNull PyCallableType dropSelf(@NotNull TypeEvalContext context) {
     final List<PyCallableParameter> parameters = getParameters(context);
-    if (parameters != null && myCallable instanceof PyFunction function) {
+    if (!ContainerUtil.isEmpty(parameters) && myCallable instanceof PyFunction function) {
       final List<PyCallableParameter> functionParameters = function.getParameters(context);
 
       if (!ContainerUtil.isEmpty(functionParameters) && functionParameters.get(0).isSelf()) {