I'm using the librairy within a textview, when changing the text (my text being a spannable string with some formating) using readmore.setText() the app crashes for some text displayiing the following message error

at java.lang.String.getChars(String.java:788)
at android.text.SpannableStringInternal.getChars(SpannableStringInternal.java:178)
at android.text.TextUtils.getChars(TextUtils.java:154)
at android.text.SpannableStringBuilder.(SpannableStringBuilder.java:68)
at com.colormoon.readmoretextview.ReadMoreTextView.updateCollapsedText(ReadMoreTextView.kt:123)
at com.colormoon.readmoretextview.ReadMoreTextView.getTrimmedText(ReadMoreTextView.kt:98)
at com.colormoon.readmoretextview.ReadMoreTextView.getDisplayableText(ReadMoreTextView.kt:72)
at com.colormoon.readmoretextview.ReadMoreTextView.setText(ReadMoreTextView.kt:66)
at com.colormoon.readmoretextview.ReadMoreTextView.setText(ReadMoreTextView.kt:77)
at android.widget.TextView.setText(TextView.java:6106)

What can be the issue