bug fix, graphhopper#1316

Author: karussell

core/src/main/java/com/graphhopper/storage/BaseGraph.java

@@ -27,12 +27,11 @@
 import com.graphhopper.search.NameIndex;
 import com.graphhopper.util.*;
 import com.graphhopper.util.shapes.BBox;
-
-import static com.graphhopper.util.Helper.nf;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import static com.graphhopper.util.Helper.nf;
+
 /**
  * The base graph handles nodes and edges file format. It can be used with different Directory
  * implementations like RAMDirectory for fast access or via MMapDirectory for virtual-memory and not
@@ -703,12 +702,12 @@ void inPlaceNodeRemove(int removeNodeCount) {
                 setWayGeometry_(fetchWayGeometry_(edgePointer, true, 0, -1, -1), edgePointer, false);
         }
 
-        // clear N_EDGE_REF
-        initNodeRefs((nodeCount - removeNodeCount) * nodeEntryBytes, nodeCount * nodeEntryBytes);
-
         if (removeNodeCount >= nodeCount)
             throw new IllegalStateException("graph is empty after in-place removal but was " + removeNodeCount);
 
+        // clear N_EDGE_REF
+        initNodeRefs(((long) nodeCount - removeNodeCount) * nodeEntryBytes, (long) nodeCount * nodeEntryBytes);
+
         // we do not remove the invalid edges => edgeCount stays the same!
         nodeCount -= removeNodeCount;