maybe adding placeholder is necessary for index none

app.py

@@ -140,14 +140,14 @@ with st.sidebar:
     tes = dk_roo_main[dk_roo_main['Position'] == 'TE']['Player'].unique()
     flex = dk_roo_main['Player'].unique()
     # Create multiselect dropdowns for each position
-    selected_qbs = st.selectbox('Select QB:', list(qbs), index=None, key='qb1')
-    selected_rb1 = st.selectbox('Select RB1:', list(rbs), index=None, key='rb1')
-    selected_rb2 = st.selectbox('Select RB2:', list(rbs), index=None, key='rb2')
-    selected_wr1 = st.selectbox('Select WR1:', list(wrs), index=None, key='wr1')
-    selected_wr2 = st.selectbox('Select WR2:', list(wrs), index=None, key='wr2')
-    selected_wr3 = st.selectbox('Select WR3:', list(wrs), index=None, key='wr3')
-    selected_te = st.selectbox('Select TE:', list(tes), index=None, key='te')
-    selected_flex = st.selectbox('Select Flex:', list(flex), index=None, key='flex')
+    selected_qbs = st.selectbox('Select QB:', list(qbs), index=None, placeholder='Select QB', key='qb1')
+    selected_rb1 = st.selectbox('Select RB1:', list(rbs), index=None, placeholder='Select RB1', key='rb1')
+    selected_rb2 = st.selectbox('Select RB2:', list(rbs), index=None, placeholder='Select RB2', key='rb2')
+    selected_wr1 = st.selectbox('Select WR1:', list(wrs), index=None, placeholder='Select WR1', key='wr1')
+    selected_wr2 = st.selectbox('Select WR2:', list(wrs), index=None, placeholder='Select WR2', key='wr2')
+    selected_wr3 = st.selectbox('Select WR3:', list(wrs), index=None, placeholder='Select WR3', key='wr3')
+    selected_te = st.selectbox('Select TE:', list(tes), index=None, placeholder='Select TE', key='te')
+    selected_flex = st.selectbox('Select Flex:', list(flex), index=None, placeholder='Select Flex', key='flex')
 
     # Combine all selected players
     all_selected = selected_qbs + selected_rb1 + selected_rb2 + selected_wr1 + selected_wr2 + selected_wr3 + selected_te + selected_flex