diff --git a/common/src/main/java/ctbrec/Config.java b/common/src/main/java/ctbrec/Config.java
index 3b54e0f8..75f5bf63 100644
--- a/common/src/main/java/ctbrec/Config.java
+++ b/common/src/main/java/ctbrec/Config.java
@@ -90,6 +90,10 @@ public class Config {
         } else {
             src = new File(configDirectory, previousVersion.toString());
         }
+        if (!src.exists()) {
+            // new installation
+            return;
+        }
         if (!Objects.equals(previousVersion, currentVersion)) {
             LOG.debug("Version update {} -> {}", previousVersion, currentVersion);
             LOG.debug("Copying config from {} to {}", src, target);
@@ -98,11 +102,16 @@ public class Config {
     }
 
     private Version getPreviousVersion(File configDirectory) {
-        Optional<Version> previousVersion = Arrays.stream(configDirectory.listFiles((dir, name) -> name.matches("\\d+\\.\\d+\\.\\d+")))
-                .map(File::getName)
-                .map(Version::of)
-                .max(Comparator.naturalOrder());
-        return previousVersion.orElse(Version.of("4.7.5"));
+        File[] versionDirectories = configDirectory.listFiles((dir, name) -> name.matches("\\d+\\.\\d+\\.\\d+"));
+        if (versionDirectories != null) {
+            Optional<Version> previousVersion = Arrays.stream(versionDirectories)
+                    .map(File::getName)
+                    .map(Version::of)
+                    .max(Comparator.naturalOrder());
+            return previousVersion.orElse(Version.of("4.7.5"));
+        } else {
+            return Version.of("4.7.5");
+        }
     }
 
     private void load() throws IOException {