diff --git a/README.md b/README.md
index 6bb969f..a3091e4 100644
--- a/README.md
+++ b/README.md
@@ -6,9 +6,7 @@ A plugin for ImageJ to provide macro extensions to access OMERO.
 
 ## How to install
 
-1. Install
-   the [OMERO.insight plugin for Fiji](https://omero-guides.readthedocs.io/en/latest/fiji/docs/installation.html) (if
-   you haven't already).
+1. Install the [OMERO.insight plugin for Fiji](https://omero-guides.readthedocs.io/en/latest/fiji/docs/installation.html) (if you haven't already).
 2. Download the JAR file for this [library](https://github.com/GReD-Clermont/simple-omero-client/releases/latest/).
 3. Download the JAR file ([for this plugin](https://github.com/GReD-Clermont/omero_macro-extensions/releases/latest/)).
 4. Place these JAR files in your plugins folder.
@@ -193,8 +191,8 @@ imageplusID = Ext.getImage(imageIds[0]);
 
 ROIs from OMERO can also be added to the ROI manager (and the current image). ROIs composed of multiple shapes (eg
 3D/4D) will share the same values in the "ROI" and "ROI_ID" properties in ImageJ. These can be optionnally changed with
-the "property" parameter: local indices will be in "property" while OMERO IDs will be in "property + _ID". 
-This is achieved through:
+the "property" parameter: local indices will be in "property" while OMERO IDs will be in "property + _ID". This is
+achieved through:
 
 ```
 nIJROIs = Ext.getROIs(imageIds[0], property);
diff --git a/src/main/java/fr/igred/ij/plugin/OMEROMacroExtension.java b/src/main/java/fr/igred/ij/plugin/OMEROMacroExtension.java
index e49dafc..8c3f698 100644
--- a/src/main/java/fr/igred/ij/plugin/OMEROMacroExtension.java
+++ b/src/main/java/fr/igred/ij/plugin/OMEROMacroExtension.java
@@ -243,16 +243,20 @@ public void deleteFile(long fileId) {
     public void addToTable(String tableName, ResultsTable results, Long imageId, List<Roi> ijRois, String property) {
         TableWrapper table = tables.get(tableName);
 
-        try {
-            if (table == null) {
-                table = new TableWrapper(client, results, imageId, ijRois, property);
-                table.setName(tableName);
-                tables.put(tableName, table);
-            } else {
-                table.addRows(client, results, imageId, ijRois, property);
+        if(results == null) {
+            IJ.error("Results table does not exist.");
+        } else {
+            try {
+                if (table == null) {
+                    table = new TableWrapper(client, results, imageId, ijRois, property);
+                    table.setName(tableName);
+                    tables.put(tableName, table);
+                } else {
+                    table.addRows(client, results, imageId, ijRois, property);
+                }
+            } catch (ExecutionException | ServiceException | AccessException e) {
+                IJ.error("Could not add results to table: " + e.getMessage());
             }
-        } catch (ExecutionException | ServiceException | AccessException e) {
-            IJ.error("Could not add results to table: " + e.getMessage());
         }
     }