1 files changed, 2 insertions, 0 deletions
diff --git a/src/ir.cpp b/src/ir.cpp
index 6fbea22b09..fb1670fe82 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -10233,6 +10233,8 @@ static TypeTableEntry *ir_analyze_instruction_switch_br(IrAnalyze *ira,
 
     for (size_t i = 0; i < case_count; i += 1) {
         IrInstructionSwitchBrCase *new_case = &cases[i];
+        if (new_case->value == ira->codegen->invalid_instruction)
+            return ir_unreach_error(ira);
         new_case->block->ref_instruction = &switch_br_instruction->base;
     }