diff --git a/Source/Errors.swift b/Source/Errors.swift
index 815ae6b..3f9e8d3 100644
--- a/Source/Errors.swift
+++ b/Source/Errors.swift
@@ -8,5 +8,6 @@ public enum StickersError: Error {
     case dataTypeMismatch
     case setIsEmpty
     case emojiIsEmpty
+    case emojisInvalid
     case telegramNotInstalled
 }
diff --git a/Source/StickerSet.swift b/Source/StickerSet.swift
index 69b54c5..9feee10 100644
--- a/Source/StickerSet.swift
+++ b/Source/StickerSet.swift
@@ -130,10 +130,18 @@ public class StickerSet {
         if emojis.isEmpty {
             throw StickersError.emojiIsEmpty
         }
+        if !arrayContainsEmoji(array: emojis) {
+            throw StickersError.emojisInvalid
+        }
         if try self.validateData(data) {
             self.stickers.append(Sticker(data: data, emojis: emojis))
         }
     }
+
+    /// Returns true if an array contains at least 1 valid emoji
+    func arrayContainsEmoji(array: [String]) -> Bool {
+        return array.contains { $0.containsEmoji }
+    }
     
     /**
         Sets a thumbnail of the sticker set using the provided data.
diff --git a/Source/StringExtension.swift b/Source/StringExtension.swift
new file mode 100644
index 0000000..7c25c75
--- /dev/null
+++ b/Source/StringExtension.swift
@@ -0,0 +1,11 @@
+extension String {
+    /// Checks if a string is a valid emoji
+    var containsEmoji: Bool {
+        for scalar in self.unicodeScalars {
+            if scalar.properties.isEmoji && (scalar.value > 0x238C) { // Exclude non-graphical symbols
+                return true
+            }
+        }
+        return false
+    }
+}