diff --git a/java/src/processing/mode/java/pdex/ErrorCheckerService.java b/java/src/processing/mode/java/pdex/ErrorCheckerService.java
index bc58d43e8..45e79d7a3 100644
--- a/java/src/processing/mode/java/pdex/ErrorCheckerService.java
+++ b/java/src/processing/mode/java/pdex/ErrorCheckerService.java
@@ -779,13 +779,13 @@ public class ErrorCheckerService {
     final String exclude = "exclude";
 
     if (impName.startsWith("processing")) {
-      if (JavaMode.suggestionsMap.get(include).contains(impName)) {
+      if (JavaMode.suggestionsMap.containsKey(include) && JavaMode.suggestionsMap.get(include).contains(impName)) {
         return false;
-      } else if (JavaMode.suggestionsMap.get(exclude).contains(impName)) {
+      } else if (JavaMode.suggestionsMap.containsKey(exclude) && JavaMode.suggestionsMap.get(exclude).contains(impName)) {
         return true;
       }
     } else if (impName.startsWith("java")) {
-      if (JavaMode.suggestionsMap.get(include).contains(impName)) {
+      if (JavaMode.suggestionsMap.containsKey(include) && JavaMode.suggestionsMap.get(include).contains(impName)) {
         return false;
       }
     }