Fixes #555. Guard against null ptr

Signed-off-by: Terence Parr <[email protected]>
antlr · May 21, 2022 · 4fa1cc8 · 4fa1cc8
1 parent bd2e599
commit 4fa1cc8
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/main/java/org/antlr/intellij/plugin/preview/InputPanel.java b/src/main/java/org/antlr/intellij/plugin/preview/InputPanel.java
@@ -234,7 +234,7 @@ public void documentChanged(DocumentEvent event) {
 
 	public void grammarFileSaved() {
 		clearParseErrors();
-		if ( previewState.startRuleName!=null ) {
+		if ( previewState!=null && previewState.startRuleName!=null ) {
 			setStartRuleName(previewState.grammarFile, previewState.startRuleName);
 		}
 		else {