Conflict with FLIP Fluids addon: AttributeError: 'RNA_Types' object has no attribute 'PHYSICS_PT_add'

[rlguy]

Hi,

I develop a liquid simulation Blender addon called FLIP Fluids. We have had some users report that there is a conflict between the Blend4Web addon and the FLIP Fluids addon. An AttributeError is encountered when installing FLIP Fluids if the Blend4Web addon is enabled and installed.

I have tested this issue using the blend4web_addon_18_05_0.zip addon downloaded from https://www.blend4web.com/en/downloads/

Here is a minimal script that reproduces the error when run from the Blender text editor:

import bpy
print(bpy.types.PHYSICS_PT_add)

When Blend4Web is enabled, an error is produced:

AttributeError: 'RNA_Types' object has no attribute 'PHYSICS_PT_add'

When Blend4Web is disabled, the script runs to completion:

<class 'bl_ui.properties_physics_common.PHYSICS_PT_add'>