diff --git a/plugins/github/github-core/src/org/jetbrains/plugins/github/pullrequest/ui/diff/GHPRReviewDiffExtension.kt b/plugins/github/github-core/src/org/jetbrains/plugins/github/pullrequest/ui/diff/GHPRReviewDiffExtension.kt
index bbae08552904..15a28dc4142a 100644
--- a/plugins/github/github-core/src/org/jetbrains/plugins/github/pullrequest/ui/diff/GHPRReviewDiffExtension.kt
+++ b/plugins/github/github-core/src/org/jetbrains/plugins/github/pullrequest/ui/diff/GHPRReviewDiffExtension.kt
@@ -192,7 +192,9 @@ private class DiffEditorModel(
       Side.LEFT -> range.end1
       Side.RIGHT -> range.end2
     }
-    val end = locationToLine(side to endLineIdx.dec())?.inc() ?: return null
+    val end =
+      if (startLineIdx == endLineIdx) start
+      else locationToLine(side to endLineIdx.dec())?.inc() ?: return null
     return LineRange(start, end)
   }