diff --git a/python/src/com/jetbrains/python/codeInsight/dataflow/PyReachingDefsDfaInstance.java b/python/src/com/jetbrains/python/codeInsight/dataflow/PyReachingDefsDfaInstance.java
index 057824afae1d..ed9259c22158 100644
--- a/python/src/com/jetbrains/python/codeInsight/dataflow/PyReachingDefsDfaInstance.java
+++ b/python/src/com/jetbrains/python/codeInsight/dataflow/PyReachingDefsDfaInstance.java
@@ -31,6 +31,9 @@ public class PyReachingDefsDfaInstance implements DfaMapInstance<ScopeVariable>
         return map;
       }
       final String name = rwInstruction.getName();
+      if (name == null){
+        return map;
+      }
       final ScopeVariable variable = map.get(name);
       // Parameter case
       final PsiElement parameterScope = ScopeUtil.getParameterScope(element);