Fix google#124

Yannic · Aug 27, 2017 · cb0e02f · cb0e02f
1 parent d2c0cce
commit cb0e02f
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/com/google/common/css/RecordingSubstitutionMap.java b/src/com/google/common/css/RecordingSubstitutionMap.java
@@ -88,7 +88,9 @@ public void initializeWithMappings(Map<? extends String, ? extends String> newMa
     Preconditions.checkState(mappings.isEmpty());
     if (!newMappings.isEmpty()) {
       mappings.putAll(newMappings);
-      ((SubstitutionMap.Initializable) delegate).initializeWithMappings(newMappings);
+      if (delegate instanceof SubstitutionMap.Initializable) {
+        ((SubstitutionMap.Initializable) delegate).initializeWithMappings(newMappings);
+      }
     }
   }