diff --git a/packages/core/index.ts b/packages/core/index.ts
index fe31eb21..30272f8b 100644
--- a/packages/core/index.ts
+++ b/packages/core/index.ts
@@ -13,10 +13,8 @@ export { default as nodeInputRule } from './src/inputRules/nodeInputRule'
 export { default as markInputRule } from './src/inputRules/markInputRule'
 export { default as markPasteRule } from './src/pasteRules/markPasteRule'
 
-export { default as capitalize } from './src/utils/capitalize'
 export { default as getSchema } from './src/utils/getSchema'
 export { default as generateHTML } from './src/utils/generateHTML'
 export { default as getHTMLFromFragment } from './src/utils/getHTMLFromFragment'
 export { default as getMarkAttrs } from './src/utils/getMarkAttrs'
 export { default as mergeAttributes } from './src/utils/mergeAttributes'
-export { default as fromString } from './src/utils/fromString'
diff --git a/packages/core/src/utils/capitalize.ts b/packages/core/src/utils/capitalize.ts
deleted file mode 100644
index 0b9c9d48..00000000
--- a/packages/core/src/utils/capitalize.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export default function capitalize(value = ''): string {
-  return value.charAt(0).toUpperCase() + value.slice(1)
-}
diff --git a/packages/core/src/utils/fromString.ts b/packages/core/src/utils/fromString.ts
index 5371abcc..2ef70c76 100644
--- a/packages/core/src/utils/fromString.ts
+++ b/packages/core/src/utils/fromString.ts
@@ -1,4 +1,8 @@
 export default function fromString(value: any) {
+  if (typeof value !== 'string') {
+    return value
+  }
+
   if (value.match(/^\d*(\.\d+)?$/)) {
     return Number(value)
   }
diff --git a/tests/cypress/integration/core/capitalize.spec.ts b/tests/cypress/integration/core/capitalize.spec.ts
deleted file mode 100644
index 2693a958..00000000
--- a/tests/cypress/integration/core/capitalize.spec.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-/// <reference types="cypress" />
-
-import { capitalize } from '@tiptap/core'
-
-describe('capitalize test', () => {
-  it('capitalize a word', () => {
-    const capitalized = capitalize('test')
-
-    expect(capitalized).to.eq('Test')
-  })
-})
diff --git a/tests/cypress/integration/core/example.spec.ts b/tests/cypress/integration/core/example.spec.ts
deleted file mode 100644
index 985f70da..00000000
--- a/tests/cypress/integration/core/example.spec.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-describe('example test', () => {
-  it('should work', () => {
-    expect('<p>Example Text</p>').to.eq('<p>Example Text</p>')
-  })
-})
diff --git a/tests/cypress/integration/core/fromString.spec.ts b/tests/cypress/integration/core/fromString.spec.ts
index 6ecb92bf..2aa6aaa1 100644
--- a/tests/cypress/integration/core/fromString.spec.ts
+++ b/tests/cypress/integration/core/fromString.spec.ts
@@ -1,41 +1,47 @@
 /// <reference types="cypress" />
 
-import { fromString } from '@tiptap/core'
+import fromString from '@tiptap/core/src/utils/fromString'
 
 describe('fromString', () => {
-  it('parse a string', () => {
+  it('should return a string', () => {
     const value = fromString('test')
 
     expect(value).to.eq('test')
   })
 
-  it('parse a number', () => {
+  it('should convert to a number', () => {
     const value = fromString('1')
 
     expect(value).to.eq(1)
   })
 
-  it('parse a floating number', () => {
+  it('should convert to a floating number', () => {
     const value = fromString('1.2')
 
     expect(value).to.eq(1.2)
   })
 
-  it('parse not a number with exponent', () => {
+  it('should not convert to a number with exponent', () => {
     const value = fromString('1e1')
 
     expect(value).to.eq('1e1')
   })
 
-  it('parse a boolean (true)', () => {
+  it('should convert to true', () => {
     const value = fromString('true')
 
     expect(value).to.eq(true)
   })
 
-  it('parse a boolean (false)', () => {
+  it('should convert to false', () => {
     const value = fromString('false')
 
     expect(value).to.eq(false)
   })
+
+  it('should return non-strings', () => {
+    const value = fromString(null)
+
+    expect(value).to.eq(null)
+  })
 })