If you roll back to 1.3.189 and try to export for iOS you will get a series of errors (actually just one at a time, but one for each of the keys below). It can be fixed by adding some (now missing) keys to the "options_ios.yy" file which is in your project folder under /options/ios.
Add :
"option_ios_splashscreen_iphone_landscape": "${options_dir}\\ios\\splash\\ipad_retina_7_landscape.png",
"option_ios_splashscreen_iphone_retina_landscape": "${options_dir}\\ios\\splash\\ipad_retina_7_landscape.png",
"option_ios_splashscreen_iphone_portrait": "${options_dir}\\ios\\splash\\iphone_56_portrait.png",
"option_ios_splashscreen_iphone_retina_portrait": "${options_dir}\\ios\\splash\\iphone_56_portrait.png",
"option_ios_splashscreen_iphone_5_landscape": "${options_dir}\\ios\\splash\\ipad_retina_7_landscape.png",
"option_ios_splashscreen_iphone_5_portrait": "${options_dir}\\ios\\splash\\iphone_8_55_portrait.png",
"option_ios_splashscreen_iphone_6_landscape": "${options_dir}\\ios\\splash\\ipad_retina_7_landscape.png",
"option_ios_splashscreen_iphone_6_portrait": "${options_dir}\\ios\\splash\\iphone_8_55_portrait.png",
"option_ios_splashscreen_iphone_6_plus_landscape": "${options_dir}\\ios\\splash\\ipad_retina_7_landscape.png",
"option_ios_splashscreen_iphone_6_plus_portrait": "${options_dir}\\ios\\splash\\iphone_8_55_portrait.png",
and it will build. I haven't actually tried each device to see what the splash screens look like so I might have the mappings wrong, but it builds.