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-rw-r--r--src/wat-writer.cc9
1 files changed, 6 insertions, 3 deletions
diff --git a/src/wat-writer.cc b/src/wat-writer.cc
index f3c46afe..9eadcce7 100644
--- a/src/wat-writer.cc
+++ b/src/wat-writer.cc
@@ -356,9 +356,12 @@ void WatWriter::WriteVar(const Var* var, NextChar next_char) {
void WatWriter::WriteBrVar(const Var* var, NextChar next_char) {
if (var->type == VarType::Index) {
- assert(var->index < GetLabelStackSize());
- Writef("%" PRIindex " (;@%" PRIindex ";)", var->index,
- GetLabelStackSize() - var->index - 1);
+ if (var->index < GetLabelStackSize()) {
+ Writef("%" PRIindex " (;@%" PRIindex ";)", var->index,
+ GetLabelStackSize() - var->index - 1);
+ } else {
+ Writef("%" PRIindex " (; INVALID ;)", var->index);
+ }
next_char_ = next_char;
} else {
WriteStringSlice(&var->name, next_char);