I added a timeline earlier and attempted to load my project again just now and am continuously hit with this error message.
Error report information
Type: assertion failure
Message: index must be greater or equal to 0
Stack: Error at Function.ǃQ.ǃQdn (https://editor.construct.net/r171-2/main.js:2:124319) at e (https://editor.construct.net/r171-2/main.js:2:85002) at window.assert (https://editor.construct.net/r171-2/main.js:2:85332) at i.ǃfal (https://editor.construct.net/r171-2/projectResources.js:1:443487) at editor.construct.net/r171-2/projectResources.js:1:18387 at Array.map () at n.ǃfaM (https://editor.construct.net/r171-2/projectResources.js:1:18368) at n.ǃbK (https://editor.construct.net/r171-2/projectResources.js:1:15874) at i.ǃbK (https://editor.construct.net/r171-2/projectResources.js:1:434682) at t.ǃftN (https://editor.construct.net/r171-2/projectResources.js:1:36246)
Construct 3 version: r171.2
URL: editor.construct.net
Date: Thu Oct 17 2019 18:59:35 GMT-0600 (Mountain Daylight Time)
Uptime: 14.4 s
Platform information
Browser: Chrome
Browser version: 77.0.3865.105
Browser engine: Chromium
Browser architecture: (unknown)
Context: browser
Operating system: Chrome OS
Operating system version: (unknown)
Operating system architecture: 64-bit
Device type: desktop
Device pixel ratio: 1
Logical CPU cores: 2
Approx. device memory: 2 GB
User agent: Mozilla/5.0 (X11; CrOS x86_64 12371.75.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.105 Safari/537.36
C3 release: r171.2 (stable)
Language setting: en-US
WebGL information
Version string: WebGL 2.0 (OpenGL ES 3.0 Chromium)
Numeric version: 2
Supports NPOT textures: yes
Supports GPU profiling: yes
Supports highp precision: yes
Vendor: Intel Open Source Technology Center
Renderer: Mesa DRI Intel(R) HD Graphics 400 (Braswell)
Major performance caveat: no
Maximum texture size: 16384
Point size range: 1 to 255
Extensions: EXT_color_buffer_float, EXT_disjoint_timer_query_webgl2, EXT_float_blend, EXT_texture_filter_anisotropic, OES_texture_float_linear, WEBGL_compressed_texture_etc, WEBGL_compressed_texture_etc1, WEBGL_compressed_texture_s3tc, WEBGL_compressed_texture_s3tc_srgb, WEBGL_debug_renderer_info, WEBGL_debug_shaders, WEBGL_lose_context