Index: trunk/src/org/openstreetmap/josm/data/projection/Projections.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/projection/Projections.java	(revision 18028)
+++ trunk/src/org/openstreetmap/josm/data/projection/Projections.java	(revision 18030)
@@ -362,5 +362,5 @@
      */
     public static Projection getProjectionByCode(String code) {
-        return projectionsByCodeCache.computeIfAbsent(code, Projections::computeProjectionByCode);
+        return code != null ? projectionsByCodeCache.computeIfAbsent(code, Projections::computeProjectionByCode) : null;
     }