[10:32:59] [main/ERROR]: Minecraft has crashed!
net.fabricmc.loader.impl.FormattedException: java.lang.ExceptionInInitializerError
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:463) ~[fabric-loader-0.14.8.jar:?]
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) [fabric-loader-0.14.8.jar:?]
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) [fabric-loader-0.14.8.jar:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
at org.polymc.impl.OneSixLauncher.invokeMain(OneSixLauncher.java:104) [NewLaunch.jar:?]
at org.polymc.impl.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:175) [NewLaunch.jar:?]
at org.polymc.impl.OneSixLauncher.launch(OneSixLauncher.java:185) [NewLaunch.jar:?]
at org.polymc.EntryPoint.listen(EntryPoint.java:144) [NewLaunch.jar:?]
at org.polymc.EntryPoint.main(EntryPoint.java:74) [NewLaunch.jar:?]
Caused by: java.lang.ExceptionInInitializerError
at eu.pb4.polymer.impl.client.InternalClientRegistry.(InternalClientRegistry.java:78) ~[polymer-0.2.7+1.19-3eefbc273624f70c.jar:?]
at net.minecraft.class_1761.handler$hoa000$polymer_storeInMap(class_1761.java:3039) ~[client-intermediary.jar:?]
at net.minecraft.class_1761.(class_1761.java:117) ~[client-intermediary.jar:?]
at net.minecraft.class_1761$1.(class_1761.java:15) ~[client-intermediary.jar:?]
at net.minecraft.class_1761.(class_1761.java:15) ~[client-intermediary.jar:?]
at io.wispforest.jello.Jello.(Jello.java:59) ~[jello-4.1.0+1.19.jar:?]
at io.wispforest.jello.api.dye.registry.DyeColorantRegistry.(DyeColorantRegistry.java:34) ~[jello-4.1.0+1.19.jar:?]
at net.minecraft.class_2248.(class_2248.java:183) ~[client-intermediary.jar:?]
at net.minecraft.class_2189.(class_2189.java:12) ~[client-intermediary.jar:?]
at net.minecraft.class_2246.(class_2246.java:103) ~[client-intermediary.jar:?]
at net.minecraft.class_5872.(class_5872.java:9) ~[client-intermediary.jar:?]
at net.minecraft.class_5871.method_33968(class_5871.java:20) ~[client-intermediary.jar:?]
at com.mojang.serialization.codecs.RecordCodecBuilder.mapCodec(RecordCodecBuilder.java:76) ~[datafixerupper-5.0.28.jar:?]
at net.minecraft.class_5871.(class_5871.java:16) ~[client-intermediary.jar:?]
at net.minecraft.class_2939.(class_2939.java:32) ~[client-intermediary.jar:?]
at net.minecraft.class_5463.(class_5463.java:21) ~[client-intermediary.jar:?]
at net.minecraft.class_5458.method_30572(class_5458.java:66) ~[client-intermediary.jar:?]
at net.minecraft.class_5458.method_44104(class_5458.java:98) ~[client-intermediary.jar:?]
at net.minecraft.class_5458.method_30566(class_5458.java:105) ~[client-intermediary.jar:?]
at java.util.LinkedHashMap.forEach(LinkedHashMap.java:721) ~[?:?]
at net.minecraft.class_5458.(class_5458.java:104) ~[client-intermediary.jar:?]
at net.minecraft.class_2378.(class_2378.java:326) ~[client-intermediary.jar:?]
at net.minecraft.class_2966.method_12851(class_2966.java:50) ~[client-intermediary.jar:?]
at net.minecraft.client.main.Main.main(Main.java:154) ~[minecraft-1.19-client.jar:?]
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:461) ~[fabric-loader-0.14.8.jar:?]
... 11 more
Caused by: java.lang.NullPointerException: Cannot invoke "net.minecraft.class_2248.method_9564()" because "net.minecraft.class_2246.field_10124" is null
at eu.pb4.polymer.api.client.registry.ClientPolymerBlock.(ClientPolymerBlock.java:23) ~[polymer-0.2.7+1.19-3eefbc273624f70c.jar:?]
at eu.pb4.polymer.impl.client.InternalClientRegistry.(InternalClientRegistry.java:78) ~[polymer-0.2.7+1.19-3eefbc273624f70c.jar:?]
at net.minecraft.class_1761.handler$hoa000$polymer_storeInMap(class_1761.java:3039) ~[client-intermediary.jar:?]
at net.minecraft.class_1761.(class_1761.java:117) ~[client-intermediary.jar:?]
at net.minecraft.class_1761$1.(class_1761.java:15) ~[client-intermediary.jar:?]
at net.minecraft.class_1761.(class_1761.java:15) ~[client-intermediary.jar:?]
at io.wispforest.jello.Jello.(Jello.java:59) ~[jello-4.1.0+1.19.jar:?]
at io.wispforest.jello.api.dye.registry.DyeColorantRegistry.(DyeColorantRegistry.java:34) ~[jello-4.1.0+1.19.jar:?]
at net.minecraft.class_2248.(class_2248.java:183) ~[client-intermediary.jar:?]
at net.minecraft.class_2189.(class_2189.java:12) ~[client-intermediary.jar:?]
at net.minecraft.class_2246.(class_2246.java:103) ~[client-intermediary.jar:?]
at net.minecraft.class_5872.(class_5872.java:9) ~[client-intermediary.jar:?]
at net.minecraft.class_5871.method_33968(class_5871.java:20) ~[client-intermediary.jar:?]
at com.mojang.serialization.codecs.RecordCodecBuilder.mapCodec(RecordCodecBuilder.java:76) ~[datafixerupper-5.0.28.jar:?]
at net.minecraft.class_5871.(class_5871.java:16) ~[client-intermediary.jar:?]
at net.minecraft.class_2939.(class_2939.java:32) ~[client-intermediary.jar:?]
at net.minecraft.class_5463.(class_5463.java:21) ~[client-intermediary.jar:?]
at net.minecraft.class_5458.method_30572(class_5458.java:66) ~[client-intermediary.jar:?]
at net.minecraft.class_5458.method_44104(class_5458.java:98) ~[client-intermediary.jar:?]
at net.minecraft.class_5458.method_30566(class_5458.java:105) ~[client-intermediary.jar:?]
at java.util.LinkedHashMap.forEach(LinkedHashMap.java:721) ~[?:?]
at net.minecraft.class_5458.(class_5458.java:104) ~[client-intermediary.jar:?]
at net.minecraft.class_2378.(class_2378.java:326) ~[client-intermediary.jar:?]
at net.minecraft.class_2966.method_12851(class_2966.java:50) ~[client-intermediary.jar:?]
at net.minecraft.client.main.Main.main(Main.java:154) ~[minecraft-1.19-client.jar:?]
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:461) ~[fabric-loader-0.14.8.jar:?]
... 11 more

Fixed with 6a32377 which will be released some time soon in the future