diff --git a/internal/server/state.go b/internal/server/state.go
index 365f255..782447e 100644
--- a/internal/server/state.go
+++ b/internal/server/state.go
@@ -126,6 +126,9 @@ func ParseConfig(conf string) (raw RawConfig, err error) {
 			return
 		}
 	}
+	if raw.ProxyBook == nil {
+		raw.ProxyBook = make(map[string][]string)
+	}
 	return
 }