diff --git a/lib/index.js b/lib/index.js
index ee5d6fb..a1e32c5 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -15,8 +15,8 @@
  */
 export function fromPoint(point) {
   return {
-    character: point.column - 1,
-    line: point.line - 1
+    character: point.column ? point.column - 1 : 0,
+    line: point.line ? point.line - 1 : 0
   }
 }
 
diff --git a/test/index.js b/test/index.js
index d23b316..c4beedb 100644
--- a/test/index.js
+++ b/test/index.js
@@ -17,6 +17,19 @@ test('fromPoint', async () => {
     {line: 42, character: 99},
     'should convert unist points to LSP positions'
   )
+
+  assert.deepEqual(
+    fromPoint({line: 0, column: 0}),
+    {line: 0, character: 0},
+    'should convert unist points with zero values'
+  )
+
+  assert.deepEqual(
+    // @ts-expect-error We test invalid user input here.
+    fromPoint({line: null, column: null}),
+    {line: 0, character: 0},
+    'should convert unist points with null values'
+  )
 })
 
 test('toPoint', async () => {