diff --git a/src/main.zig b/src/main.zig
index 6d99c02..a9c60bb 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -415,7 +415,7 @@ fn nodeToCompletion(
                     } else false;
 
                     break :blk try analysis.getFunctionSnippet(&arena.allocator, tree, func, skip_self_param);
-                } else null;
+                } else "";
 
                 const is_type_function = analysis.isTypeFunction(handle.tree, func);
 
diff --git a/src/types.zig b/src/types.zig
index bd13ef1..13633a3 100644
--- a/src/types.zig
+++ b/src/types.zig
@@ -230,8 +230,8 @@ pub const CompletionItem = struct {
     label: []const u8,
     kind: Kind,
     textEdit: ?TextEdit = null,
-    filterText: ?[]const u8 = null,
-    insertText: ?[]const u8 = null,
+    filterText: []const u8 = "",
+    insertText: []const u8 = "",
     insertTextFormat: ?InsertTextFormat = .PlainText,
     detail: ?[]const u8 = null,
     documentation: ?MarkupContent = null,
diff --git a/tests/sessions.zig b/tests/sessions.zig
index 0ba3a4b..dce35e9 100644
--- a/tests/sessions.zig
+++ b/tests/sessions.zig
@@ -138,7 +138,7 @@ test "Requesting a completion with no trailing whitespace" {
     try sendRequest(completion_req, process);
     try sendRequest(shutdown_message, process);
     try consumeOutputAndWait(process, .{
-        \\{"jsonrpc":"2.0","id":2,"result":{"isIncomplete":false,"items":[{"label":"std","kind":21,"textEdit":null,"filterText":null,"insertText":null,"insertTextFormat":1,"detail":"const std = @import(\"std\")","documentation":null}]}}
+        \\{"jsonrpc":"2.0","id":2,"result":{"isIncomplete":false,"items":[{"label":"std","kind":21,"textEdit":null,"filterText":"","insertText":"","insertTextFormat":1,"detail":"const std = @import(\"std\")","documentation":null}]}}
     });
 }