diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index bd9675f1dda59d..4d1b9e22c083f6 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -2391,9 +2391,13 @@ void InnerLoopVectorizer::recordVectorLoopValueForInductionCast(
   if (isa<TruncInst>(EntryVal))
     return;
 
-  const SmallVectorImpl<Instruction *> &Casts = ID.getCastInsts();
-  if (Casts.empty())
+  if (!CastDef) {
+    assert(ID.getCastInsts().empty() &&
+           "there are casts for ID, but no CastDef");
     return;
+  }
+  assert(!ID.getCastInsts().empty() &&
+         "there is a CastDef, but no casts for ID");
   // Only the first Cast instruction in the Casts vector is of interest.
   // The rest of the Casts (if exist) have no uses outside the
   // induction update chain itself.