When editing all colors to the same color in the \ui_global_variables.json file
it will cause the game to crash randomly when searching in the creative inventory this issue can be recreated by changing the color value 

Replace these values [0.3, 0.3, 0.3]  and [ 1.0, 1.0, 1.0 ]

in the whole file with this value [0.619, 0.941, 0.258]  then save and then load the resource [pack ingame you will notice the color value has turned a lime green for most text colors but when exploring the creative inventory quickly looking through spawn eggs it will crash the game instantly with no warnings or anything.

This issue exists in 1.9 and still, exist in the new beta versions 1.10 and in 1.11.0.1 and 1.11.0.3.