Fix failure when exception backtrace is nil

2 files changed, 21 insertions, 1 deletions

diff --git a/lib/bundler/cli/exec.rb b/lib/bundler/cli/exec.rb
index d6ac453676..386565c575 100644
--- a/lib/bundler/cli/exec.rb
+++ b/lib/bundler/cli/exec.rb
@@ -77,7 +77,7 @@ module Bundler
     rescue Exception => e # rubocop:disable Lint/RescueException
       Bundler.ui = ui
       Bundler.ui.error "bundler: failed to load command: #{cmd} (#{file})"
-      backtrace = e.backtrace.take_while {|bt| !bt.start_with?(__FILE__) }
+      backtrace = e.backtrace ? e.backtrace.take_while {|bt| !bt.start_with?(__FILE__) } : []
       abort "#{e.class}: #{e.message}\n  #{backtrace.join("\n  ")}"
     end
 
diff --git a/spec/commands/exec_spec.rb b/spec/commands/exec_spec.rb
index 5c11129dd8..05d01ff01d 100644
--- a/spec/commands/exec_spec.rb
+++ b/spec/commands/exec_spec.rb
@@ -606,6 +606,26 @@ RSpec.describe "bundle exec" do
       it_behaves_like "it runs"
     end
 
+    context "the executable raises an error without a backtrace", :bundler => "< 2" do
+      let(:executable) { super() << "\nclass Err < Exception\ndef backtrace; end;\nend\nraise Err" }
+      let(:exit_code) { 1 }
+      let(:expected_err) do
+        "bundler: failed to load command: #{path} (#{path})\nErr: Err"
+      end
+
+      it_behaves_like "it runs"
+    end
+
+    context "the executable raises an error without a backtrace", :bundler => "2" do
+      let(:executable) { super() << "\nclass Err < Exception\ndef backtrace; end;\nend\nraise Err" }
+      let(:exit_code) { 1 }
+      let(:expected_err) do
+        "bundler: failed to load command: #{path} (#{path})\nErr: Err"
+      end
+
+      it_behaves_like "it runs"
+    end
+
     context "when the file uses the current ruby shebang" do
       let(:shebang) { "#!#{Gem.ruby}" }
       it_behaves_like "it runs"