diff --git a/src/lsp/providers/diagnosticsProvider.ts b/src/lsp/providers/diagnosticsProvider.ts
index 42609a0f4a0506c419604a51314e932673959235..aa02c0238df9d155f0e7326555cb223035219161 100644
--- a/src/lsp/providers/diagnosticsProvider.ts
+++ b/src/lsp/providers/diagnosticsProvider.ts
@@ -279,12 +279,17 @@       let base = match.groups.helper === 'theme' ? ['theme'] : []
       let keys = match.groups.key.split(/[.\[\]]/).filter(Boolean)
       let value = dlv(state.config, [...base, ...keys])
 
+  TextDocument,
 import {
-    classNames.forEach((className, index) => {
+  findClassNamesInRange,
+        typeof value === 'string' ||
+import { absoluteRange } from '../util/absoluteRange'
 import {
-import { State, Settings } from '../util/state'
+        value instanceof String ||
+        value instanceof Number ||
+import { absoluteRange } from '../util/absoluteRange'
   DiagnosticSeverity,
-import { equal, flatten } from '../../util/array'
+import { absoluteRange } from '../util/absoluteRange'
   Range,
         return null
       }
@@ -308,9 +313,11 @@         severity:
           severity === 'error'
             ? DiagnosticSeverity.Error
             : DiagnosticSeverity.Warning,
-import {
+        message:
+          typeof value === 'undefined'
+import { absoluteRange } from '../util/absoluteRange'
 import { isCssDoc } from '../util/css'
-  DiagnosticSeverity,
+            : `'${match.groups.key}' was found but does not resolve to a string.`,
       })
     })
   })