diff --git a/dspace-api/src/main/java/org/dspace/content/BitstreamServiceImpl.java b/dspace-api/src/main/java/org/dspace/content/BitstreamServiceImpl.java
index 691d38f03039..e23e5ce2c825 100644
--- a/dspace-api/src/main/java/org/dspace/content/BitstreamServiceImpl.java
+++ b/dspace-api/src/main/java/org/dspace/content/BitstreamServiceImpl.java
@@ -458,10 +458,15 @@ public int countTotal(Context context) throws SQLException {
 
     @Override
     public Bitstream findByIdOrLegacyId(Context context, String id) throws SQLException {
-        if (StringUtils.isNumeric(id)) {
-            return findByLegacyId(context, Integer.parseInt(id));
-        } else {
-            return find(context, UUID.fromString(id));
+        try {
+            if (StringUtils.isNumeric(id)) {
+                return findByLegacyId(context, Integer.parseInt(id));
+            } else {
+                return find(context, UUID.fromString(id));
+            }
+        } catch (IllegalArgumentException e) {
+            // Not a valid legacy ID or valid UUID
+            return null;
         }
     }
 
diff --git a/dspace-api/src/main/java/org/dspace/content/BundleServiceImpl.java b/dspace-api/src/main/java/org/dspace/content/BundleServiceImpl.java
index 546d48d4306b..3ba90c8cc2ae 100644
--- a/dspace-api/src/main/java/org/dspace/content/BundleServiceImpl.java
+++ b/dspace-api/src/main/java/org/dspace/content/BundleServiceImpl.java
@@ -562,10 +562,15 @@ public int getSupportsTypeConstant() {
 
     @Override
     public Bundle findByIdOrLegacyId(Context context, String id) throws SQLException {
-        if (StringUtils.isNumeric(id)) {
-            return findByLegacyId(context, Integer.parseInt(id));
-        } else {
-            return find(context, UUID.fromString(id));
+        try {
+            if (StringUtils.isNumeric(id)) {
+                return findByLegacyId(context, Integer.parseInt(id));
+            } else {
+                return find(context, UUID.fromString(id));
+            }
+        } catch (IllegalArgumentException e) {
+            // Not a valid legacy ID or valid UUID
+            return null;
         }
     }
 
diff --git a/dspace-api/src/main/java/org/dspace/content/CollectionServiceImpl.java b/dspace-api/src/main/java/org/dspace/content/CollectionServiceImpl.java
index be763713ec1a..652d2a5f38a0 100644
--- a/dspace-api/src/main/java/org/dspace/content/CollectionServiceImpl.java
+++ b/dspace-api/src/main/java/org/dspace/content/CollectionServiceImpl.java
@@ -895,10 +895,15 @@ public void updateLastModified(Context context, Collection collection) throws SQ
 
     @Override
     public Collection findByIdOrLegacyId(Context context, String id) throws SQLException {
-        if (StringUtils.isNumeric(id)) {
-            return findByLegacyId(context, Integer.parseInt(id));
-        } else {
-            return find(context, UUID.fromString(id));
+        try {
+            if (StringUtils.isNumeric(id)) {
+                return findByLegacyId(context, Integer.parseInt(id));
+            } else {
+                return find(context, UUID.fromString(id));
+            }
+        } catch (IllegalArgumentException e) {
+            // Not a valid legacy ID or valid UUID
+            return null;
         }
     }
 
diff --git a/dspace-api/src/main/java/org/dspace/content/CommunityServiceImpl.java b/dspace-api/src/main/java/org/dspace/content/CommunityServiceImpl.java
index 15ac1c58a690..045adc229e79 100644
--- a/dspace-api/src/main/java/org/dspace/content/CommunityServiceImpl.java
+++ b/dspace-api/src/main/java/org/dspace/content/CommunityServiceImpl.java
@@ -694,10 +694,15 @@ public void updateLastModified(Context context, Community community) {
 
     @Override
     public Community findByIdOrLegacyId(Context context, String id) throws SQLException {
-        if (StringUtils.isNumeric(id)) {
-            return findByLegacyId(context, Integer.parseInt(id));
-        } else {
-            return find(context, UUID.fromString(id));
+        try {
+            if (StringUtils.isNumeric(id)) {
+                return findByLegacyId(context, Integer.parseInt(id));
+            } else {
+                return find(context, UUID.fromString(id));
+            }
+        } catch (IllegalArgumentException e) {
+            // Not a valid legacy ID or valid UUID
+            return null;
         }
     }
 
diff --git a/dspace-api/src/main/java/org/dspace/content/ItemServiceImpl.java b/dspace-api/src/main/java/org/dspace/content/ItemServiceImpl.java
index f6144961c6f0..a0847e4be2b3 100644
--- a/dspace-api/src/main/java/org/dspace/content/ItemServiceImpl.java
+++ b/dspace-api/src/main/java/org/dspace/content/ItemServiceImpl.java
@@ -1618,10 +1618,15 @@ protected void getAuthoritiesAndConfidences(String fieldKey, Collection collecti
 
     @Override
     public Item findByIdOrLegacyId(Context context, String id) throws SQLException {
-        if (StringUtils.isNumeric(id)) {
-            return findByLegacyId(context, Integer.parseInt(id));
-        } else {
-            return find(context, UUID.fromString(id));
+        try {
+            if (StringUtils.isNumeric(id)) {
+                return findByLegacyId(context, Integer.parseInt(id));
+            } else {
+                return find(context, UUID.fromString(id));
+            }
+        } catch (IllegalArgumentException e) {
+            // Not a valid legacy ID or valid UUID
+            return null;
         }
     }
 
diff --git a/dspace-api/src/main/java/org/dspace/eperson/EPersonServiceImpl.java b/dspace-api/src/main/java/org/dspace/eperson/EPersonServiceImpl.java
index b9fde450c2e1..b9ac740685bd 100644
--- a/dspace-api/src/main/java/org/dspace/eperson/EPersonServiceImpl.java
+++ b/dspace-api/src/main/java/org/dspace/eperson/EPersonServiceImpl.java
@@ -146,10 +146,15 @@ public EPerson getSystemEPerson(Context c)
 
     @Override
     public EPerson findByIdOrLegacyId(Context context, String id) throws SQLException {
-        if (StringUtils.isNumeric(id)) {
-            return findByLegacyId(context, Integer.parseInt(id));
-        } else {
-            return find(context, UUID.fromString(id));
+        try {
+            if (StringUtils.isNumeric(id)) {
+                return findByLegacyId(context, Integer.parseInt(id));
+            } else {
+                return find(context, UUID.fromString(id));
+            }
+        } catch (IllegalArgumentException e) {
+            // Not a valid legacy ID or valid UUID
+            return null;
         }
     }
 
diff --git a/dspace-api/src/main/java/org/dspace/eperson/GroupServiceImpl.java b/dspace-api/src/main/java/org/dspace/eperson/GroupServiceImpl.java
index b8d8c75d0f2e..730053e42ce2 100644
--- a/dspace-api/src/main/java/org/dspace/eperson/GroupServiceImpl.java
+++ b/dspace-api/src/main/java/org/dspace/eperson/GroupServiceImpl.java
@@ -872,10 +872,15 @@ protected Set<UUID> getChildren(Map<UUID, Set<UUID>> parents, UUID parent) {
 
     @Override
     public Group findByIdOrLegacyId(Context context, String id) throws SQLException {
-        if (org.apache.commons.lang3.StringUtils.isNumeric(id)) {
-            return findByLegacyId(context, Integer.parseInt(id));
-        } else {
-            return find(context, UUIDUtils.fromString(id));
+        try {
+            if (StringUtils.isNumeric(id)) {
+                return findByLegacyId(context, Integer.parseInt(id));
+            } else {
+                return find(context, UUID.fromString(id));
+            }
+        } catch (IllegalArgumentException e) {
+            // Not a valid legacy ID or valid UUID
+            return null;
         }
     }