diff --git a/package-lock.json b/package-lock.json
index 2c433ae3..474c181c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3841,14 +3841,24 @@
       }
     },
     "node_modules/caniuse-lite": {
-      "version": "1.0.30001302",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001302.tgz",
-      "integrity": "sha512-YYTMO+tfwvgUN+1ZnRViE53Ma1S/oETg+J2lISsqi/ZTNThj3ZYBOKP2rHwJc37oCsPqAzJ3w2puZHn0xlLPPw==",
+      "version": "1.0.30001642",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001642.tgz",
+      "integrity": "sha512-3XQ0DoRgLijXJErLSl+bLnJ+Et4KqV1PY6JJBGAFlsNsz31zeAIncyeZfLCabHK/jtSh+671RM9YMldxjUPZtA==",
       "dev": true,
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/browserslist"
-      }
+      "funding": [
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/browserslist"
+        },
+        {
+          "type": "tidelift",
+          "url": "https://tidelift.com/funding/github/npm/caniuse-lite"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ]
     },
     "node_modules/chalk": {
       "version": "4.1.2",
@@ -15935,9 +15945,9 @@
       }
     },
     "caniuse-lite": {
-      "version": "1.0.30001302",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001302.tgz",
-      "integrity": "sha512-YYTMO+tfwvgUN+1ZnRViE53Ma1S/oETg+J2lISsqi/ZTNThj3ZYBOKP2rHwJc37oCsPqAzJ3w2puZHn0xlLPPw==",
+      "version": "1.0.30001642",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001642.tgz",
+      "integrity": "sha512-3XQ0DoRgLijXJErLSl+bLnJ+Et4KqV1PY6JJBGAFlsNsz31zeAIncyeZfLCabHK/jtSh+671RM9YMldxjUPZtA==",
       "dev": true
     },
     "chalk": {
diff --git a/src/components/project/UploadDialog.vue b/src/components/project/UploadDialog.vue
index cfd926c1..fd1bae2f 100644
--- a/src/components/project/UploadDialog.vue
+++ b/src/components/project/UploadDialog.vue
@@ -225,8 +225,9 @@ export default defineComponent({
     checkSentIdsErrors(fileContent: string, sampleName: string) {
       const sentIds: any[] = [];
       this.formatError = false;
-      const sentences = fileContent.split(/\n\n/).filter((sentence) => sentence);
+      const sentences = fileContent.replace(/[\r]/g, "").split(/\n\n/).filter((sentence) => sentence);
       for (const sentence of sentences) {
+        this.checkSentFormatError(sentence, sampleName)
         if (this.formatError) return;
         if (sentenceConllToJson(sentence)['metaJson']['sent_id']) {
           const sentId = sentenceConllToJson(sentence)['metaJson']['sent_id'];
@@ -235,7 +236,16 @@ export default defineComponent({
       }
       if (sentences.length !== sentIds.length) this.samplesWithoutSentIds.push(sampleName);
     },
-    
+    checkSentFormatError(sentence: string, sampleName: string) {
+      if (/\n\s*\n\S/.test(sentence)) {
+        notifyError({ error: `${sampleName} contains empty line that doesn't start with a digit or # ` });
+        this.formatError = true;
+      }
+      if (Object.values(sentenceConllToJson(sentence)['metaJson']).some((metaVal) => metaVal == undefined)) {
+        notifyError({ error: `${sampleName} contains sentence with empty metadata value` });
+        this.formatError = true;
+      }
+    },
     triggerFormatErrors() {
       this.samplesWithoutSentIds.forEach((sampleName) => {
         this.warningMessage += `"${sampleName}" has sentences without sent_id.\n`;