Index: clang/include/clang/Analysis/Analyses/Dominators.h
===================================================================
--- clang/include/clang/Analysis/Analyses/Dominators.h
+++ clang/include/clang/Analysis/Analyses/Dominators.h
@@ -101,7 +101,12 @@
              "LLVM's Dominator tree builder uses nullpointers to signify the "
              "virtual root!");
 
-      DomTreeNode *IDom = DT.getNode(*I)->getIDom();
+      auto *Node = DT.getNode(*I);
+      if (Node == nullptr) {
+        continue;
+      }
+
+      DomTreeNode *IDom = Node->getIDom();
       if (IDom && IDom->getBlock())
         llvm::errs() << "(" << (*I)->getBlockID()
                      << ","