Index: trunk/src/org/openstreetmap/josm/data/cache/JCSCacheManager.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/cache/JCSCacheManager.java	(revision 10568)
+++ trunk/src/org/openstreetmap/josm/data/cache/JCSCacheManager.java	(revision 10570)
@@ -241,6 +241,6 @@
 
     private static void deleteCacheFiles(String basePathPart) {
-        Utils.deleteFile(new File(basePathPart + ".key"));
-        Utils.deleteFile(new File(basePathPart + ".data"));
+        Utils.deleteFileIfExists(new File(basePathPart + ".key"));
+        Utils.deleteFileIfExists(new File(basePathPart + ".data"));
     }
 
Index: trunk/src/org/openstreetmap/josm/tools/Utils.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/Utils.java	(revision 10568)
+++ trunk/src/org/openstreetmap/josm/tools/Utils.java	(revision 10570)
@@ -492,4 +492,18 @@
 
     /**
+     * Deletes a file and log a default warning if the file exists but the deletion fails.
+     * @param file file to delete
+     * @return {@code true} if and only if the file does not exist or is successfully deleted; {@code false} otherwise
+     * @since 10569
+     */
+    public static boolean deleteFileIfExists(File file) {
+        if (file.exists()) {
+            return deleteFile(file);
+        } else {
+            return true;
+        }
+    }
+
+    /**
      * Deletes a file and log a default warning if the deletion fails.
      * @param file file to delete