Fix division by zero for blame age map

1 files changed, 10 insertions, 6 deletions

diff --git a/app/helpers/blame_helper.rb b/app/helpers/blame_helper.rb
index d1dc4d94560..089d9e3e387 100644
--- a/app/helpers/blame_helper.rb
+++ b/app/helpers/blame_helper.rb
@@ -11,11 +11,15 @@ module BlameHelper
   end
 
   def age_map_class(commit_date, duration)
-    commit_date_days_ago = (duration[:now] - commit_date).to_i / 1.day
-    # Numbers 0 to 10 come from this calculation, but only commits on the oldest
-    # day get number 10 (all other numbers can be multiple days), so the range
-    # is normalized to 0-9
-    age_group = [(10 * commit_date_days_ago) / duration[:started_days_ago], 9].min
-    "blame-commit-age-#{age_group}"
+    if duration[:started_days_ago] == 0
+      "blame-commit-age-0"
+    else
+      commit_date_days_ago = (duration[:now] - commit_date).to_i / 1.day
+      # Numbers 0 to 10 come from this calculation, but only commits on the oldest
+      # day get number 10 (all other numbers can be multiple days), so the range
+      # is normalized to 0-9
+      age_group = [(10 * commit_date_days_ago) / duration[:started_days_ago], 9].min
+      "blame-commit-age-#{age_group}"
+    end
   end
 end