diff --git a/README.md b/README.md
index dba4c65..0abc77a 100644
--- a/README.md
+++ b/README.md
@@ -54,9 +54,9 @@ match Code::inline_from("```inline```") {
 ``` rust
 match Code::multiline_begin_from("```alt") {
     Some(mut multiline) => {
-        Code::multiline_continue_from(&mut multiline, "line 1");
-        Code::multiline_continue_from(&mut multiline, "line 2");
-        Code::multiline_continue_from(&mut multiline, "```"); // complete
+        assert!(Code::multiline_continue_from(&mut multiline, "line 1").is_ok());
+        assert!(Code::multiline_continue_from(&mut multiline, "line 2").is_ok());
+        assert!(Code::multiline_continue_from(&mut multiline, "```").is_ok()); // complete
 
         assert!(multiline.completed);
         assert_eq!(multiline.alt, Some("alt".into()));
diff --git a/src/line/code.rs b/src/line/code.rs
index f9ab3ee..eb0c4df 100644
--- a/src/line/code.rs
+++ b/src/line/code.rs
@@ -1,6 +1,8 @@
+pub mod error;
 pub mod inline;
 pub mod multiline;
 
+pub use error::Error;
 use inline::Inline;
 use multiline::Multiline;
 
@@ -19,7 +21,10 @@ impl Code {
         Multiline::begin_from(line)
     }
 
-    pub fn multiline_continue_from(this: &mut Multiline, line: &str) {
-        Multiline::continue_from(this, line)
+    pub fn multiline_continue_from(this: &mut Multiline, line: &str) -> Result<(), Error> {
+        match Multiline::continue_from(this, line) {
+            Ok(()) => Ok(()),
+            Err(e) => Err(Error::Multiline(e)),
+        }
     }
 }
diff --git a/src/line/code/error.rs b/src/line/code/error.rs
new file mode 100644
index 0000000..410dfe3
--- /dev/null
+++ b/src/line/code/error.rs
@@ -0,0 +1,16 @@
+use std::fmt::{Display, Formatter, Result};
+
+#[derive(Debug)]
+pub enum Error {
+    Multiline(crate::line::code::multiline::Error),
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        match self {
+            Self::Multiline(e) => {
+                write!(f, "Multiline error: {e}")
+            }
+        }
+    }
+}
diff --git a/src/line/code/multiline.rs b/src/line/code/multiline.rs
index 0180df1..fe42870 100644
--- a/src/line/code/multiline.rs
+++ b/src/line/code/multiline.rs
@@ -1,3 +1,6 @@
+pub mod error;
+pub use error::Error;
+
 use glib::GString;
 
 pub struct Multiline {
@@ -28,10 +31,10 @@ impl Multiline {
 
     /// Continue preformatted buffer from line,
     /// set `completed` as True on close tag found
-    pub fn continue_from(&mut self, line: &str) {
+    pub fn continue_from(&mut self, line: &str) -> Result<(), Error> {
         // Make sure buffer not completed yet
         if self.completed {
-            panic!("Could not continue as completed") // @TODO handle
+            return Err(Error::Completed);
         }
 
         // Line contain close tag
@@ -42,5 +45,7 @@ impl Multiline {
         // Append data to the buffer, trim close tag on exists
         self.buffer
             .push(GString::from(line.trim_end_matches("```")));
+
+        Ok(())
     }
 }
diff --git a/src/line/code/multiline/error.rs b/src/line/code/multiline/error.rs
new file mode 100644
index 0000000..78d0474
--- /dev/null
+++ b/src/line/code/multiline/error.rs
@@ -0,0 +1,16 @@
+use std::fmt::{Display, Formatter, Result};
+
+#[derive(Debug)]
+pub enum Error {
+    Completed,
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        match self {
+            Self::Completed => {
+                write!(f, "Could not continue as completed!")
+            }
+        }
+    }
+}
diff --git a/tests/integration.rs b/tests/integration.rs
index 5aa2cd9..b41b8ba 100644
--- a/tests/integration.rs
+++ b/tests/integration.rs
@@ -50,7 +50,7 @@ fn gemtext() {
                         }
                     }
                     Some(ref mut result) => {
-                        Code::multiline_continue_from(result, line);
+                        assert!(Code::multiline_continue_from(result, line).is_ok());
                         if result.completed {
                             code_multiline.push(code_multiline_buffer.take().unwrap());
                             code_multiline_buffer = None;