diff --git a/src/Server.zig b/src/Server.zig
index e42348b..c38fe89 100644
--- a/src/Server.zig
+++ b/src/Server.zig
@@ -2442,7 +2442,7 @@ pub fn processJsonRpc(server: *Server, writer: anytype, json: []const u8) !void
                     []const u8 => switch (value) {
                         .String => |s| blk: {
                             var nv = try server.allocator.dupe(u8, s);
-                            server.allocator.free(@field(server.config, field.name).?);
+                            if (@field(server.config, field.name)) |prev_val| server.allocator.free(prev_val);
                             break :blk nv;
                         }, // TODO: Allocation model? (same with didChangeConfiguration); imo this isn't *that* bad but still
                         else => @panic("Invalid configuration value"), // TODO: Handle this