diff --git a/package.json b/package.json
index 144a27b..77e8141 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "coverage": "nyc report --reporter=text-lcov | coveralls",
     "coverage:report": "export NETWORK=mainnet && nyc --reporter=html mocha --timeout 25000 test/v4/",
     "docs": "./node_modules/.bin/apidoc -i src/routes/v4 -o docs",
-    "test:temp1": "export NETWORK=mainnet && export TEST=integration && mocha --exit --timeout 25000 -g '#getNftChildren' test/v4/integration/",
+    "test:temp1": "export NETWORK=mainnet && export TEST=integration && export SLPDB_URL=https://slpdb.fountainhead.cash/ && mocha --exit --timeout 25000 -g '#nft' test/v4/integration/",
     "test:temp2": "mocha -g '#getNftGroup' --exit --timeout 30000 test/v4/"
   },
   "engines": {
diff --git a/src/routes/v4/slp.js b/src/routes/v4/slp.js
index 1538e98..6509118 100644
--- a/src/routes/v4/slp.js
+++ b/src/routes/v4/slp.js
@@ -2284,7 +2284,8 @@ class Slp {
       const childrenRes = await _this.axios.request(opt)
       // console.log(`childrenRes.data: ${JSON.stringify(childrenRes.data, null, 2)}`)
       if (!childrenRes || !childrenRes.data || !childrenRes.data.t) {
-        return { error: 'No children data in the group' }
+        res.status(400)
+        return res.json({ error: 'No children data in the group' })
       }
 
       childrenRes.data.t.forEach(function (token) {
diff --git a/test/v4/integration/nft.js b/test/v4/integration/nft.js
index f26e686..563b4f2 100644
--- a/test/v4/integration/nft.js
+++ b/test/v4/integration/nft.js
@@ -35,6 +35,31 @@ describe('#nft', () => {
   })
 
   describe('#getNftChildren', () => {
+    it('should return error on non-existing NFT group token', async () => {
+      req.params.tokenId =
+        '68cd33ecd909068fbea318ae5ff1d6207cf754e53b191327d6d73b6916424c0b'
+      const result = await slp.getNftChildren(req, res)
+      // console.log(`result: ${util.inspect(result)}`)
+
+      assert.include(
+        result.error,
+        'NFT group does not exists',
+        'Error message expected'
+      )
+    })
+    it('should return error on non-group NFT token', async () => {
+      req.params.tokenId =
+        '45a30085691d6ea586e3ec2aa9122e9b0e0d6c3c1fd357decccc15d8efde48a9'
+
+      const result = await slp.getNftChildren(req, res)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
+
+      assert.include(
+        result.error,
+        'NFT group does not exists',
+        'Error message expected'
+      )
+    })
     it('should get NFT children list', async () => {
       req.params.tokenId =
         '68cd33ecd909068fbea318ae5ff1d6207cf754e53b191327d6d73b6916424c0a'
@@ -56,6 +81,18 @@ describe('#nft', () => {
   })
 
   describe('#getNftGroup', () => {
+    it('should return error on non-existing NFT child token', async () => {
+      req.params.tokenId =
+        '45a30085691d6ea586e3ec2aa9122e9b0e0d6c3c1fd357decccc15d8efde48a8'
+      const result = await slp.getNftGroup(req, res)
+      // console.log(`result: ${util.inspect(result)}`)
+
+      assert.include(
+        result.error,
+        'NFT child does not exists',
+        'Error message expected'
+      )
+    })
     it('should get NFT group token info', async () => {
       req.params.tokenId =
         '45a30085691d6ea586e3ec2aa9122e9b0e0d6c3c1fd357decccc15d8efde48a9'