diff --git a/lib/vmfloaty/abs.rb b/lib/vmfloaty/abs.rb
index d75a658..2426c32 100644
--- a/lib/vmfloaty/abs.rb
+++ b/lib/vmfloaty/abs.rb
@@ -172,10 +172,10 @@ class ABS
       res_body = JSON.parse(res.body)
       if res_body.key?('vmpooler_platforms')
         os_list << '*** VMPOOLER Pools ***'
-        if res_body['vmpooler_platforms'].is_a?(Hash)
-          os_list += res_body['vmpooler_platforms']
-        else
+        if res_body['vmpooler_platforms'].is_a?(String)
           os_list += JSON.parse(res_body['vmpooler_platforms']) # legacy ABS had another JSON string always-be-scheduling/pull/306
+        else
+          os_list += res_body['vmpooler_platforms']
         end
       end
     end
@@ -186,10 +186,10 @@ class ABS
       if res_body.key?('ondemand_vmpooler_platforms') && res_body['ondemand_vmpooler_platforms'] != '[]'
         os_list << ''
         os_list << '*** VMPOOLER ONDEMAND Pools ***'
-        if res_body['ondemand_vmpooler_platforms'].is_a?(Hash)
-          os_list += res_body['ondemand_vmpooler_platforms']
-        else
+        if res_body['ondemand_vmpooler_platforms'].is_a?(String)
           os_list += JSON.parse(res_body['ondemand_vmpooler_platforms']) # legacy ABS had another JSON string always-be-scheduling/pull/306
+        else
+          os_list += res_body['ondemand_vmpooler_platforms']
         end
       end
     end
@@ -200,10 +200,10 @@ class ABS
       if res_body.key?('nspooler_platforms')
         os_list << ''
         os_list << '*** NSPOOLER Pools ***'
-        if res_body['nspooler_platforms'].is_a?(Hash)
-          os_list += res_body['nspooler_platforms']
-        else
+        if res_body['nspooler_platforms'].is_a?(String)
           os_list += JSON.parse(res_body['nspooler_platforms']) # legacy ABS had another JSON string always-be-scheduling/pull/306
+        else
+          os_list += res_body['nspooler_platforms']
         end
       end
     end
@@ -214,10 +214,10 @@ class ABS
       if res_body.key?('aws_platforms')
         os_list << ''
         os_list << '*** AWS Pools ***'
-        if res_body['aws_platforms'].is_a?(Hash)
-          os_list += res_body['aws_platforms']
-        else
+        if res_body['aws_platforms'].is_a?(String)
           os_list += JSON.parse(res_body['aws_platforms']) # legacy ABS had another JSON string always-be-scheduling/pull/306
+        else
+          os_list += res_body['aws_platforms']
         end
       end
     end
diff --git a/spec/vmfloaty/abs_spec.rb b/spec/vmfloaty/abs_spec.rb
index 5e82993..40804cf 100644
--- a/spec/vmfloaty/abs_spec.rb
+++ b/spec/vmfloaty/abs_spec.rb
@@ -9,6 +9,50 @@ describe ABS do
   before :each do
   end
 
+  describe '#list' do
+    it 'skips empty platforms and lists aws' do
+      stub_request(:get, "http://foo/status/platforms/vmpooler").
+          to_return(:status => 200, :body => "", :headers => {})
+      stub_request(:get, "http://foo/status/platforms/ondemand_vmpooler").
+          to_return(:status => 200, :body => "", :headers => {})
+      stub_request(:get, "http://foo/status/platforms/nspooler").
+          to_return(:status => 200, :body => "", :headers => {})
+      body = '{
+                "aws_platforms": [
+                  "amazon-6-x86_64",
+                  "amazon-7-x86_64",
+                  "amazon-7-arm64",
+                  "centos-7-x86-64-west",
+                  "redhat-8-arm64"
+                ]
+              }'
+      stub_request(:get, "http://foo/status/platforms/aws").
+          to_return(:status => 200, :body => body, :headers => {})
+
+
+      results = ABS.list(false, "http://foo")
+
+      expect(results).to include("amazon-6-x86_64", "amazon-7-x86_64", "amazon-7-arm64", "centos-7-x86-64-west", "redhat-8-arm64")
+    end
+    it 'legacy JSON string, prior to PR 306' do
+      stub_request(:get, "http://foo/status/platforms/vmpooler").
+          to_return(:status => 200, :body => "", :headers => {})
+      stub_request(:get, "http://foo/status/platforms/ondemand_vmpooler").
+          to_return(:status => 200, :body => "", :headers => {})
+      stub_request(:get, "http://foo/status/platforms/nspooler").
+          to_return(:status => 200, :body => "", :headers => {})
+      body = '{
+          "aws_platforms": "[\"amazon-6-x86_64\",\"amazon-7-x86_64\",\"amazon-7-arm64\",\"centos-7-x86-64-west\",\"redhat-8-arm64\"]"
+      }'
+      stub_request(:get, "http://foo/status/platforms/aws").
+          to_return(:status => 200, :body => body, :headers => {})
+
+      results = ABS.list(false, "http://foo")
+
+      expect(results).to include("amazon-6-x86_64", "amazon-7-x86_64", "amazon-7-arm64", "centos-7-x86-64-west", "redhat-8-arm64")
+    end
+  end
+
   describe '#format' do
     it 'returns an hash formatted like a vmpooler return, plus the job_id' do
       job_id = "generated_by_floaty_12345"