Add null pointer check.

llvm-svn: 68281
diff --git a/clang/lib/Analysis/BugReporter.cpp b/clang/lib/Analysis/BugReporter.cpp
index 5047e71..7637a16 100644
--- a/clang/lib/Analysis/BugReporter.cpp
+++ b/clang/lib/Analysis/BugReporter.cpp
@@ -789,7 +789,8 @@
     if (const Stmt *PS = PrevLoc.asStmt())
       if (const Stmt *NS = NewLoc.asStmt()) {
         const Stmt *parentPS = PDB.getParent(PS);
-        if (isa<CompoundStmt>(parentPS) && parentPS == PDB.getParent(NS))
+        if (parentPS && isa<CompoundStmt>(parentPS) &&
+            parentPS == PDB.getParent(NS))
           return;
       }