diff --git a/markdown_it/rules_block/html_block.py b/markdown_it/rules_block/html_block.py
index 3d43f6ee..fee2a1a0 100644
--- a/markdown_it/rules_block/html_block.py
+++ b/markdown_it/rules_block/html_block.py
@@ -68,7 +68,7 @@ def html_block(state: StateBlock, startLine: int, endLine: int, silent: bool) ->
     # Let's roll down till block end.
     if not html_seq[1].search(lineText):
         while nextLine < endLine:
-            if state.sCount[nextLine] < state.blkIndent:
+            if state.sCount[nextLine] < state.blkIndent and not state.isEmpty(nextLine):
                 break
 
             pos = state.bMarks[nextLine] + state.tShift[nextLine]
diff --git a/tests/test_port/fixtures/commonmark_extras.md b/tests/test_port/fixtures/commonmark_extras.md
index f0b31dbd..0cb8d978 100644
--- a/tests/test_port/fixtures/commonmark_extras.md
+++ b/tests/test_port/fixtures/commonmark_extras.md
@@ -749,3 +749,27 @@ Issue #204. Combination of blockquotes, list and newlines causes an IndexError
 </li>
 </ul>
 .
+
+Issue #377. HTML comment block inside list item should not end at blank line
+.
+1. item
+
+    <!--
+    comment with
+
+    blank line inside
+    -->
+    paragraph
+.
+<ol>
+<li>
+<p>item</p>
+ <!--
+ comment with
+
+ blank line inside
+ -->
+<p>paragraph</p>
+</li>
+</ol>
+.