[MC-129245] Crash when entering worldsave due to "illegal character"

The bug

I currently enter 1.11 and 1.12 release worlds to see if they get successfully updated to 1.13, but I just crashed upon entering one of my worlds which I backed up before.

Crash report

18w19a: crash-2018-05-08_17.31.47-client.txt

Description: mouseClicked event handler

java.lang.IllegalArgumentException: Illegal character in path at index 105: file:/C:/Users/Meri/AppData/Roaming/.mc-snaps/backups/2018-05-08_17-31-47_BONUS%20MushroomBlocks%20Map%20[LD].zip
	at com.sun.nio.zipfs.ZipFileSystemProvider.uriToPath(ZipFileSystemProvider.java:87)
	at com.sun.nio.zipfs.ZipFileSystemProvider.newFileSystem(ZipFileSystemProvider.java:107)
	at java.nio.file.FileSystems.newFileSystem(Unknown Source)
	at java.nio.file.FileSystems.newFileSystem(Unknown Source)
	at cci.h(SourceFile:74)
	at cmj.a(SourceFile:130)
	at cml.b(SourceFile:189)
	at cit$1.a(SourceFile:45)
	at cgw.mouseClicked(SourceFile:103)
	at chs.mouseClicked(SourceFile:45)
	at cfx.b(SourceFile:67)
	at cjn.a(SourceFile:429)
	at cfx.a(SourceFile:67)
	at org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:23)
	at org.lwjgl.system.JNI.invokeV(Native Method)
	at org.lwjgl.glfw.GLFW.glfwWaitEventsTimeout(GLFW.java:2599)
	at cgf.a(SourceFile:296)
	at cfv.c(SourceFile:845)
	at cfv.a(SourceFile:381)
	at net.minecraft.client.main.Main.main(SourceFile:143)
Caused by: java.net.URISyntaxException: Illegal character in path at index 105: file:/C:/Users/Meri/AppData/Roaming/.mc-snaps/backups/2018-05-08_17-31-47_BONUS%20MushroomBlocks%20Map%20[LD].zip
	at java.net.URI$Parser.fail(Unknown Source)
	at java.net.URI$Parser.checkChars(Unknown Source)
	at java.net.URI$Parser.parseHierarchical(Unknown Source)
	at java.net.URI$Parser.parse(Unknown Source)
	at java.net.URI.<init>(Unknown Source)
	at com.sun.nio.zipfs.ZipFileSystemProvider.uriToPath(ZipFileSystemProvider.java:85)
	... 19 more