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-rwxr-xr-xdoc/tools/make_rst.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/doc/tools/make_rst.py b/doc/tools/make_rst.py
index 766aa95c4f..e1a6aa4a98 100755
--- a/doc/tools/make_rst.py
+++ b/doc/tools/make_rst.py
@@ -949,13 +949,17 @@ def make_rst_class(class_def: ClassDef, state: State, dry_run: bool, output_dir:
inherits = class_def.inherits.strip()
f.write(f'**{translate("Inherits:")}** ')
first = True
- while inherits in state.classes:
+ while inherits is not None:
if not first:
f.write(" **<** ")
else:
first = False
f.write(make_type(inherits, state))
+
+ if inherits not in state.classes:
+ break # Parent unknown.
+
inode = state.classes[inherits].inherits
if inode:
inherits = inode.strip()