diff --git a/maubot/cli/cliq/validators.py b/maubot/cli/cliq/validators.py
index 99618b9..2a98252 100644
--- a/maubot/cli/cliq/validators.py
+++ b/maubot/cli/cliq/validators.py
@@ -76,7 +76,7 @@ class VersionValidator(ClickValidator):
 
 
 def spdx(val: str) -> str:
-    if spdxlib.valid(val):
+    if not spdxlib.valid(val):
         raise click.BadParameter(f"{val} is not a valid SPDX license identifier")
     return val
 
diff --git a/maubot/cli/commands/init.py b/maubot/cli/commands/init.py
index 63bf3c2..cc6b55e 100644
--- a/maubot/cli/commands/init.py
+++ b/maubot/cli/commands/init.py
@@ -57,8 +57,9 @@ def init(name: str, id: str, version: Version, license: str, config: bool) -> No
                                 main_class=main_class)
     with open("maubot.yaml", "w") as file:
         file.write(meta)
-    with open("LICENSE", "w") as file:
-        file.write(spdx.get(license)["text"])
+    if license:
+        with open("LICENSE", "w") as file:
+            file.write(spdx.get(license)["text"])
     if not os.path.isdir(name):
         os.mkdir(name)
     mod = mod_template.render(config=config, name=main_class)