diff --git a/app/models/backtrace_line_normalizer.rb b/app/models/backtrace_line_normalizer.rb
index de35ed1..cf99551 100644
--- a/app/models/backtrace_line_normalizer.rb
+++ b/app/models/backtrace_line_normalizer.rb
@@ -1,6 +1,6 @@
 class BacktraceLineNormalizer
   def initialize(raw_line)
-    @raw_line = raw_line
+    @raw_line = raw_line || {}
   end
 
   def call
--
libgit2 0.21.2