diff --git a/src/main/java/ch/zhaw/gartenverwaltung/plantList/PlantListModel.java b/src/main/java/ch/zhaw/gartenverwaltung/plantList/PlantListModel.java
index 4bfc9b1..ffccb30 100644
--- a/src/main/java/ch/zhaw/gartenverwaltung/plantList/PlantListModel.java
+++ b/src/main/java/ch/zhaw/gartenverwaltung/plantList/PlantListModel.java
@@ -116,16 +116,17 @@ public class PlantListModel {
         if (searchString.length() == 0) {
             return getPlantList(zone);
         } else if (searchString.charAt(0) == '#') {
-            try {
-                return getFilteredPlantListById(zone, Long.parseLong(searchString.substring(1)));
-            } catch (NumberFormatException e) {
+            if (isPositiveIntegral(searchString.substring(1))) {
+                Long searchId = Long.parseLong(searchString.substring(1));
+                return getFilteredPlantListById(zone, searchId);
+            } else {
                 return new ArrayList<>();
             }
         } else {
             String caseInsensitiveSearchString = searchString.toLowerCase();
             return getFilteredPlantList(zone, plant ->
-                            plant.name().toLowerCase().contains(caseInsensitiveSearchString) ||
-                                    plant.description().toLowerCase().contains(caseInsensitiveSearchString)
+                    plant.name().toLowerCase().contains(caseInsensitiveSearchString) ||
+                            plant.description().toLowerCase().contains(caseInsensitiveSearchString)
             );
         }
     }
@@ -169,15 +170,24 @@ public class PlantListModel {
     }
 
     /**
-     *
      * @param zone selected hardiness zone
      * @param from the earliest date to for the filter
-     * @param to the lastest date for the filter
+     * @param to   the lastest date for the filter
      * @return List of Plants with selected saison
      * @throws HardinessZoneNotSetException If no {@link HardinessZone} was specified
-     * @throws IOException If the database cannot be accessed
+     * @throws IOException                  If the database cannot be accessed
      */
     public List<Plant> getFilteredPlantListBySaisonWithoutGrowthPhase(HardinessZone zone, MonthDay from, MonthDay to) throws HardinessZoneNotSetException, IOException {
         return getFilteredPlantList(zone, plant -> plant.lifecycle().stream().anyMatch(growthPhase -> growthPhase.startDate().compareTo(from) >= 0 && (growthPhase.startDate().compareTo(to) <= 0)));
     }
+
+    /**
+     * Check if a string can safely be parsed as a positive Integral value (short/int/long)
+     *
+     * @param subject The string to be tested
+     * @return Whether the string contains only digits
+     */
+    private boolean isPositiveIntegral(String subject) {
+        return subject != null && subject.matches("[0-9]+");
+    }
 }