Merge pull request #12346 from meeseeksmachine/auto-backport-of-pr-12…

…305-on-7.x

Backport PR #12305 on branch 7.x (Fix #11508: check if line_buffer is None)

IPython/core/completer.py

@@ -1982,8 +1982,8 @@ def _complete(self, *, cursor_line, cursor_pos, line_buffer=None, text=None,
         # if text is either None or an empty string, rely on the line buffer
         if (not line_buffer) and full_text:
             line_buffer = full_text.split('\n')[cursor_line]
-        if not text:
-            text = self.splitter.split_line(line_buffer, cursor_pos)
+        if not text: # issue #11508: check line_buffer before calling split_line
+            text = self.splitter.split_line(line_buffer, cursor_pos)  if line_buffer else ''
 
         if self.backslash_combining_completions:
             # allow deactivation of these on windows.