From adada7e751e2970e24b96ee861af8cf4a226af07 Mon Sep 17 00:00:00 2001
From: losfair <zhy20000919@hotmail.com>
Date: Mon, 1 Jul 2019 21:12:19 +0800
Subject: [PATCH] Only print backtrace if frames are detected

---
 lib/runtime-core/src/alternative_stack.rs | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/lib/runtime-core/src/alternative_stack.rs b/lib/runtime-core/src/alternative_stack.rs
index 102cc4abd..248ad1c79 100644
--- a/lib/runtime-core/src/alternative_stack.rs
+++ b/lib/runtime-core/src/alternative_stack.rs
@@ -230,13 +230,16 @@ extern "C" fn signal_trap_handler(
                 unwind_result = Box::new(image);
             } else {
                 use colored::*;
-                eprintln!(
-                    "\n{}",
-                    "Wasmer encountered an error while running your WebAssembly program."
-                        .bold()
-                        .red()
-                );
-                es_image.print_backtrace_if_needed();
+                if es_image.frames.len() > 0 {
+                    eprintln!(
+                        "\n{}",
+                        "Wasmer encountered an error while running your WebAssembly program."
+                            .bold()
+                            .red()
+                    );
+                    es_image.print_backtrace_if_needed();
+                }
+                // Just let the error propagate otherrwise
             }
 
             true