Add conversion patch

build.bat

@@ -12,6 +12,10 @@ set VERSION=%VERSION:"=%
 	echo [+] Downloading packages
 	go mod tidy || goto :error
 
+:patch
+	echo [+] Patching files
+	for %%f in (patches\*.patch) do patch -N -r - -d %GOPATH% -p0 < %%f
+
 :resources
 	echo [+] Generating resources
 	go generate || goto :error

patches/conversion.patch

@@ -0,0 +1,12 @@
+--- pkg/mod/github.com/fatedier/frp@v0.54.0/pkg/config/legacy/conversion.go	(revision 2af2cf7dbd7482906c0d78efb243a47b7670c773)
++++ patches/conversion.go													(revision 9152c595708fa9b8bb61473b3aec139ebda84c10)
+@@ -175,6 +175,9 @@
+ 			continue
+ 		}
+ 		if k = strings.TrimPrefix(k, "plugin_header_"); k != "" {
++			if out.Set == nil {
++				out.Set = make(map[string]string)
++			}
+ 			out.Set[k] = v
+ 		}
+ 	}