diff --git a/sync/src/main.py b/sync/src/main.py
index 170a5bf..19c4b1f 100644
--- a/sync/src/main.py
+++ b/sync/src/main.py
@@ -36,7 +36,7 @@ async def main(package_list: Path, output_dir: Path, gradle_repo: str) -> None:
 
     if not config:
         print('Error in configuration')
-    if not config.configurations:
+    elif not config.configurations:
         print('No configurations defined, nothing to do.')
     elif not config.mirrors:
         print('No mirrors defined. Add maven.mirrors in the config file.')
diff --git a/sync/src/pom.py b/sync/src/pom.py
index 997859d..cb00aa3 100644
--- a/sync/src/pom.py
+++ b/sync/src/pom.py
@@ -8,7 +8,7 @@ from xmlutils import pom_namespace as ns, find_tag_text
 
 logger = logging.getLogger(__name__)
 
-Properties: TypeAlias = dict[str, Optional[str]]
+Properties: TypeAlias = dict[str, str]
 
 
 class PropertyMissing(Exception):
@@ -76,7 +76,10 @@ class PackagePOM:
             changed = False
 
             for prop, value in props.items():
-                new_value = self._prop_replace(value, props, True)
+                try:
+                    new_value = self._prop_replace(value, props)
+                except PropertyMissing:
+                    continue
 
                 if new_value != value:
                     changed = True
@@ -85,7 +88,7 @@ class PackagePOM:
 
         self.properties = props
 
-    def _prop_replace(self, text, props: Optional[Properties] = None, quiet: bool = False) -> str:
+    def _prop_replace(self, text: str, props: Optional[Properties] = None) -> str:
         def lookup_prop(match) -> str:
             prop = match.group(1)
 
@@ -105,7 +108,7 @@ class PackagePOM:
                 except KeyError:
                     value = None
 
-            if value is None and not quiet:
+            if value is None:
                 raise PropertyMissing(prop)
             else:
                 logger.debug(f'{self.name}: Replacing property {prop} with {value}')