diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index cc98703011a..db30349dba7 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -9976,6 +9976,8 @@ void Tokenizer::simplifyAsm()
                 instruction = tok->stringifyList(endasm);
                 Token::eraseTokens(tok, endasm);
             } else if (!endasm) {
+                if (!tok->next())
+                    syntaxError(tok);
                 instruction = tok->next()->stringifyList(endasm);
                 Token::eraseTokens(tok, endasm);
                 tok->insertToken(";");
diff --git a/test/cli/fuzz-crash/crash-7d409757e9b94fc2eb23758b655e056ec3dd9d09 b/test/cli/fuzz-crash/crash-7d409757e9b94fc2eb23758b655e056ec3dd9d09
new file mode 100644
index 00000000000..8b8929bc573
--- /dev/null
+++ b/test/cli/fuzz-crash/crash-7d409757e9b94fc2eb23758b655e056ec3dd9d09
@@ -0,0 +1 @@
+_asm