diff --git a/kmath-ast/src/commonMain/kotlin/space/kscience/kmath/ast/MST.kt b/kmath-ast/src/commonMain/kotlin/space/kscience/kmath/ast/MST.kt
index 4c37b09f4..538db0caa 100644
--- a/kmath-ast/src/commonMain/kotlin/space/kscience/kmath/ast/MST.kt
+++ b/kmath-ast/src/commonMain/kotlin/space/kscience/kmath/ast/MST.kt
@@ -58,7 +58,7 @@ public fun <T> Algebra<T>.evaluate(node: MST): T = when (node) {
     is MST.Numeric -> (this as? NumericAlgebra<T>)?.number(node.value)
         ?: error("Numeric nodes are not supported by $this")
 
-    is MST.Symbolic -> bindSymbol(node.value) ?: error("Symbol '${node.value}' is not supported in $this")
+    is MST.Symbolic -> bindSymbol(node.value)
 
     is MST.Unary -> when {
         this is NumericAlgebra && node.value is MST.Numeric -> unaryOperationFunction(node.operation)(number(node.value.value))
diff --git a/kmath-ast/src/jsMain/kotlin/space/kscience/kmath/estree/estree.kt b/kmath-ast/src/jsMain/kotlin/space/kscience/kmath/estree/estree.kt
index 93b2d54c8..796ffce1e 100644
--- a/kmath-ast/src/jsMain/kotlin/space/kscience/kmath/estree/estree.kt
+++ b/kmath-ast/src/jsMain/kotlin/space/kscience/kmath/estree/estree.kt
@@ -14,11 +14,7 @@ import space.kscience.kmath.operations.NumericAlgebra
 internal fun <T> MST.compileWith(algebra: Algebra<T>): Expression<T> {
     fun ESTreeBuilder<T>.visit(node: MST): BaseExpression = when (node) {
         is Symbolic -> {
-            val symbol = try {
-                algebra.bindSymbol(node.value)
-            } catch (ignored: IllegalStateException) {
-                null
-            }
+            val symbol = algebra.bindSymbolOrNull(node.value)
 
             if (symbol != null)
                 constant(symbol)
diff --git a/kmath-ast/src/jvmMain/kotlin/space/kscience/kmath/asm/asm.kt b/kmath-ast/src/jvmMain/kotlin/space/kscience/kmath/asm/asm.kt
index 5324d74a1..ee2b6fb54 100644
--- a/kmath-ast/src/jvmMain/kotlin/space/kscience/kmath/asm/asm.kt
+++ b/kmath-ast/src/jvmMain/kotlin/space/kscience/kmath/asm/asm.kt
@@ -22,11 +22,7 @@ import space.kscience.kmath.operations.NumericAlgebra
 internal fun <T : Any> MST.compileWith(type: Class<T>, algebra: Algebra<T>): Expression<T> {
     fun AsmBuilder<T>.visit(node: MST): Unit = when (node) {
         is Symbolic -> {
-            val symbol = try {
-                algebra.bindSymbol(node.value)
-            } catch (ignored: IllegalStateException) {
-                null
-            }
+            val symbol = algebra.bindSymbolOrNull(node.value)
 
             if (symbol != null)
                 loadObjectConstant(symbol as Any)