diff --git a/angrmanagement/ui/widgets/qlinear_viewer.py b/angrmanagement/ui/widgets/qlinear_viewer.py
index 0bdcec72b..0c5c3dfe2 100644
--- a/angrmanagement/ui/widgets/qlinear_viewer.py
+++ b/angrmanagement/ui/widgets/qlinear_viewer.py
@@ -326,6 +326,9 @@ def prepare_objects(self, offset, start_line=0):
         if offset == self._offset and start_line == self._start_line_in_object:
             return
 
+        # make sure self._offset is not None after return
+        self._offset = offset
+
         # Convert the offset to memory region
         base_offset: int
         mr: MemoryRegion