Merge branch 'main' into feature/4472-Better-built-in-layer-selection

* main:
  #4476 - Exception while rendering recommendations

inception/inception-recommendation-api/src/main/java/de/tudarmstadt/ukp/inception/recommendation/api/util/OverlapIterator.java

@@ -91,7 +91,7 @@ else if (ib.hasNext()) {
             // Step to the next B from the source list
             LOG.trace("Stepping B from source Bs");
             b = ib.next();
-            if (b.getBegin() > a.getEnd()) {
+            if (a != null && b.getBegin() > a.getEnd()) {
                 // All remaining b's are beyond the end of the a's and won't overlap
                 a = null;
             }