Eevee (Blender’s real-time renderer) often crashes during extrusion due to insufficient system resources (RAM/GPU memory) or corrupted model geometry (like non-manifold edges or overlapping vertices).
Insufficient resources mean your computer can’t handle Eevee’s real-time preview of the extrusion—this overloads the GPU or RAM.
Corrupted geometry disrupts the renderer’s process, as Eevee struggles with non-manifold (unclosed) or overlapping elements.
Try these fixes: 1) Simplify the model (delete unused vertices/edges) or lower Eevee’s preview settings (e.g., reduce texture resolution) to free up resources; 2) Use Blender’s "Select Non-Manifold" tool to fix geometry errors before extruding.