diff --git a/codan/org.eclipse.cdt.codan.checkers.ui/src/org/eclipse/cdt/codan/internal/checkers/ui/quickfix/CaseBreakQuickFixFallthroughAttribute.java b/codan/org.eclipse.cdt.codan.checkers.ui/src/org/eclipse/cdt/codan/internal/checkers/ui/quickfix/CaseBreakQuickFixFallthroughAttribute.java
index 1642ae0b96b..d33ff1750f7 100644
--- a/codan/org.eclipse.cdt.codan.checkers.ui/src/org/eclipse/cdt/codan/internal/checkers/ui/quickfix/CaseBreakQuickFixFallthroughAttribute.java
+++ b/codan/org.eclipse.cdt.codan.checkers.ui/src/org/eclipse/cdt/codan/internal/checkers/ui/quickfix/CaseBreakQuickFixFallthroughAttribute.java
@@ -61,6 +61,8 @@ public class CaseBreakQuickFixFallthroughAttribute extends AbstractCaseBreakQuic
 		try {
 			IASTTranslationUnit ast = CModelUtil.toWorkingCopy(tu).getAST(null, ITranslationUnit.AST_SKIP_INDEXED_HEADERS);
 			IASTStatement beforeCaseEnd = getStmtBeforeCaseEnd(marker, ast);
+			if (beforeCaseEnd == null)
+				return false;
 			if (getNextStatement(beforeCaseEnd) == null)
 				return false;
 		} catch (CoreException | BadLocationException e) {