Error logged in console when placing a shulker box with certain nbt

Error executing task on Server
aa: Non [a-z0-9/._-] character in path of location: minecraft: 
	at ww.<init>(SourceFile:41)
	at ww.<init>(SourceFile:46)
	at cjm.c(SourceFile:48)
	at cjo.e(SourceFile:217)
	at cjo.a(SourceFile:206)
	at bot.a(SourceFile:185)
	at bot.a(SourceFile:113)
	at bot.a(SourceFile:88)
	at bot.a(SourceFile:49)
	at bqp.a(SourceFile:244)
	at abt.a(SourceFile:344)
	at acj.a(SourceFile:1067)
	at vf.a(SourceFile:30)
	at vf.a(SourceFile:8)
	at pm.a(SourceFile:21)
	at xm.run(SourceFile:18)
	at aqu.c(SourceFile:151)
	at aqy.c(SourceFile:23)
	at net.minecraft.server.MinecraftServer.b(SourceFile:783)
	at net.minecraft.server.MinecraftServer.c(SourceFile:167)
	at aqu.z(SourceFile:125)
	at net.minecraft.server.MinecraftServer.bg(SourceFile:765)
	at net.minecraft.server.MinecraftServer.z(SourceFile:759)
	at aqu.c(SourceFile:134)
	at net.minecraft.server.MinecraftServer.y(SourceFile:744)
	at net.minecraft.server.MinecraftServer.x(SourceFile:696)
	at net.minecraft.server.MinecraftServer.a(SourceFile:274)
	at java.base/java.lang.Thread.run(Thread.java:831)