diff --git a/src/flow/binary/balancing.rs b/src/flow/binary/balancing.rs
index 953f59a..96de525 100644
--- a/src/flow/binary/balancing.rs
+++ b/src/flow/binary/balancing.rs
@@ -48,7 +48,7 @@ pub enum BalancingError {
 impl Display for BalancingError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Self::Height(height_error) => write!(f, "height error: {height_error}"),
+            Self::Height(height_error) => write!(f, "invalid height: {height_error}"),
             Self::Balance(hl, hr) => write!(f, "unbalanced node: {hl} {hr}."),
             Self::HeightOverflow => write!(f, "tree height overflow"),
             Self::HeightMismatch { children, parent } => {
diff --git a/src/rstd/collections/tree.rs b/src/rstd/collections/tree.rs
index 9a2943e..bf74889 100644
--- a/src/rstd/collections/tree.rs
+++ b/src/rstd/collections/tree.rs
@@ -1,6 +1,7 @@
 use std::{error::Error, fmt::Display, rc::Rc};
 
 use crate::{
+    flow::binary::*,
     rcore::*,
     rstd::{
         atomic::{au64::*, *},
@@ -11,14 +12,15 @@ use crate::{
 
 #[derive(Debug)]
 pub enum TreeParseError<E> {
-    Height(IntParseError),
+    HeightParse(IntParseError),
     Point(PointParseError),
     Key(E),
+    HeightValue(HeightError),
 }
 
 impl<E> From<IntParseError> for TreeParseError<E> {
     fn from(value: IntParseError) -> Self {
-        Self::Height(value)
+        Self::HeightParse(value)
     }
 }
 
@@ -28,10 +30,16 @@ impl<E> From<PointParseError> for TreeParseError<E> {
     }
 }
 
+impl<E> From<HeightError> for TreeParseError<E> {
+    fn from(value: HeightError) -> Self {
+        Self::HeightValue(value)
+    }
+}
+
 impl<E: Display> Display for TreeParseError<E> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Self::Height(height_error) => {
+            Self::HeightParse(height_error) => {
                 write!(f, "failed to parse tree height: {height_error}")
             }
             Self::Point(point_error) => {
@@ -40,6 +48,9 @@ impl<E: Display> Display for TreeParseError<E> {
             Self::Key(key_error) => {
                 write!(f, "failed to parse node key: {key_error}")
             }
+            Self::HeightValue(height_error) => {
+                write!(f, "invalid height: {height_error}")
+            }
         }
     }
 }