1 files changed, 4 insertions, 3 deletions
diff --git a/src/java/jogamp/common/os/UnixDynamicLinkerImpl.java b/src/java/jogamp/common/os/UnixDynamicLinkerImpl.java
index 5e8ba9d..ddaeea2 100644
--- a/src/java/jogamp/common/os/UnixDynamicLinkerImpl.java
+++ b/src/java/jogamp/common/os/UnixDynamicLinkerImpl.java
@@ -49,15 +49,16 @@ package jogamp.common.os;
 
   @Override
   protected final long lookupSymbolLocalImpl(final long libraryHandle, final String symbolName) throws SecurityException {
-      return dlsym(libraryHandle, symbolName);
+      return 0 != libraryHandle ? dlsym(libraryHandle, symbolName) : 0;
   }
 
   @Override
   protected final void closeLibraryImpl(final long libraryHandle) throws SecurityException {
-      dlclose(libraryHandle);
+      if( 0 != libraryHandle ) {
+          dlclose(libraryHandle);
+      }
   }
 
-
   @Override
   public final String getLastError() {
       return dlerror();