diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -6895,7 +6895,8 @@
       VectorizationCostTy C = getInstructionCost(&I, VF);
 
       // Check if we should override the cost.
-      if (ForceTargetInstructionCost.getNumOccurrences() > 0)
+      if (C.first.isValid() &&
+          ForceTargetInstructionCost.getNumOccurrences() > 0)
         C.first = InstructionCost(ForceTargetInstructionCost);
 
       // Keep a list of instructions with invalid costs.
diff --git a/llvm/test/Transforms/LoopVectorize/AArch64/scalable-call.ll b/llvm/test/Transforms/LoopVectorize/AArch64/scalable-call.ll
--- a/llvm/test/Transforms/LoopVectorize/AArch64/scalable-call.ll
+++ b/llvm/test/Transforms/LoopVectorize/AArch64/scalable-call.ll
@@ -1,6 +1,9 @@
 ; RUN: opt -S -loop-vectorize -force-vector-interleave=1 -instcombine -mattr=+sve -mtriple aarch64-unknown-linux-gnu -scalable-vectorization=on \
 ; RUN:     -pass-remarks-missed=loop-vectorize < %s 2>%t | FileCheck %s
 ; RUN: cat %t | FileCheck %s --check-prefix=CHECK-REMARKS
+; RUN: opt -S -loop-vectorize -force-vector-interleave=1 -force-target-instruction-cost=1 -instcombine -mattr=+sve -mtriple aarch64-unknown-linux-gnu \
+; RUN:     -scalable-vectorization=on -pass-remarks-missed=loop-vectorize < %s 2>%t | FileCheck %s
+; RUN: cat %t | FileCheck %s --check-prefix=CHECK-REMARKS
 
 define void @vec_load(i64 %N, double* nocapture %a, double* nocapture readonly %b) {
 ; CHECK-LABEL: @vec_load